Bump MQTTnet.AspNetCore from 3.0.12-rc1 to 3.0.12

Created by: dependabot-preview[bot]

Bumps MQTTnet.AspNetCore from 3.0.12-rc1 to 3.0.12.

Release notes

Sourced from MQTTnet.AspNetCore's releases.

v3.0.12

• [LowLevelClient] Fixed a null reference exception when connecting to a not existing server (thanks to @SGStino).
• [RcpClient] Adjusted some namespaces (BREAKING CHANGE!).
• [AspNetCore] Adjusted some namespaces (BREAKING CHANGE!).
• [Server] Adjusted some namespaces (BREAKING CHANGE!).
• [Server] Added state checks (throw if not started etc.) for most server APIs.
• [Server] Exposed real X509Certificate2 (instead byte array) to TLS options (thanks to @borigas).
• [Server] Fixed memory leak with TCP sockets (MqttServer is now Disposable!) (BREAKING CHANGE!).
• [Core] Fixed a null reference exception in the MqttTcpChannel with WriteAsync and ReadAsync.
• [Core] Added server interceptor for undelivered messages (thanks to @cshark-inator).
• [nuget] Added support for SourceLink (thanks to @JTOne123).

Commits

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