Merged PR 8353: [internal/release/3.1] Update dependencies from dnceng/internal/dotnet-efcore

This pull request updates the following dependencies

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## From https://github.com/dotnet/efcore
- **Subscription**: e908e90a-0c22-4c54-b254-08d79557a113
- **Build**: 20200609.7
- **Date Produced**: 6/9/2020 9:34 PM
- **Commit**: d2274a92d61afce64e4ee11b32e71a0476456703
- **Branch**: refs/heads/internal/release/3.1
- **Updates**:
  - **Microsoft.EntityFrameworkCore.Tools**: from 3.1.5 to 3.1.6
  - **Microsoft.EntityFrameworkCore.InMemory**: from 3.1.5 to 3.1.6
  - **Microsoft.EntityFrameworkCore**: from 3.1.5 to 3.1.6
  - **Microsoft.EntityFrameworkCore.Relational**: from 3.1.5 to 3.1.6
  - **Microsoft.EntityFrameworkCore.Sqlite**: from 3.1.5 to 3.1.6
  - **dotnet-ef**: from 3.1.5 to 3.1.6
  - **Microsoft.EntityFrameworkCore.SqlServer**: from 3.1.5 to 3.1.6

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