Update dependencies from https://github.com/aspnet/AspNetCore-Tooling build 20191218.1 (#17968)

- Microsoft.AspNetCore.Mvc.Razor.Extensions - 5.0.0-alpha.1.19618.1
- Microsoft.AspNetCore.Razor.Language - 5.0.0-alpha.1.19618.1
- Microsoft.CodeAnalysis.Razor - 5.0.0-alpha.1.19618.1
- Microsoft.NET.Sdk.Razor - 5.0.0-alpha.1.19618.1

Dependency coherency updates

- Microsoft.AspNetCore.Analyzer.Testing - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.AspNetCore.BenchmarkRunner.Sources - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.ActivatorUtilities.Sources - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.Caching.Abstractions - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.Caching.Memory - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.Caching.SqlServer - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.Caching.StackExchangeRedis - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.CommandLineUtils.Sources - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.Configuration.Abstractions - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.Configuration.AzureKeyVault - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.Configuration.Binder - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.Configuration.CommandLine - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.Configuration.EnvironmentVariables - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.Configuration.FileExtensions - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.Configuration.Ini - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.Configuration.Json - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.Configuration.KeyPerFile - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.Configuration.UserSecrets - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.Configuration.Xml - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.Configuration - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.DependencyInjection.Abstractions - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.DependencyInjection - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.DiagnosticAdapter - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.Diagnostics.HealthChecks.Abstractions - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.Diagnostics.HealthChecks - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.FileProviders.Abstractions - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.FileProviders.Composite - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.FileProviders.Embedded - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.FileProviders.Physical - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.FileSystemGlobbing - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.HashCodeCombiner.Sources - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.Hosting.Abstractions - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.Hosting - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.HostFactoryResolver.Sources - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.Http - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.Localization.Abstractions - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.Localization - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.Logging.Abstractions - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.Logging.AzureAppServices - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.Logging.Configuration - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.Logging.Console - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.Logging.Debug - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.Logging.EventSource - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.Logging.EventLog - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.Logging.TraceSource - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.Logging.Testing - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.ObjectPool - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.Options.ConfigurationExtensions - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.Options.DataAnnotations - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.Options - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.ParameterDefaultValue.Sources - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.Primitives - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.TypeNameHelper.Sources - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.ValueStopwatch.Sources - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.WebEncoders - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Internal.Extensions.Refs - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.JSInterop - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Mono.WebAssembly.Interop - 5.0.0-preview3.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Extensions.Logging - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Internal.AspNetCore.Analyzers - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.AspNetCore.Testing - 5.0.0-alpha.1.19618.1 (parent: Microsoft.AspNetCore.Razor.Language)
- Microsoft.Net.Compilers.Toolset - 3.5.0-beta1-19606-04 (parent: Microsoft.Extensions.Logging)