feat: migrate to .NET 9 (#30) · Ne4to/Heartbeat@ed573f7

ubuntu-latest pipelines will use ubuntu-24.04 soon. For more details, see https://github.com/actions/runner-images/issues/10636

Publish AOT version: src/Heartbeat.Runtime/Analyzers/TimerQueueTimerAnalyzer.cs#L31

Dereference of a possibly null reference.

Publish AOT version: src/Heartbeat.Runtime/Analyzers/TimerQueueTimerAnalyzer.cs#L31

Dereference of a possibly null reference.

Publish AOT version: src/Heartbeat.Runtime/Analyzers/TimerQueueTimerAnalyzer.cs#L32

Dereference of a possibly null reference.

Publish AOT version: src/Heartbeat.Runtime/Analyzers/TimerQueueTimerAnalyzer.cs#L33

Dereference of a possibly null reference.

Publish AOT version: src/Heartbeat.Runtime/Analyzers/TimerQueueTimerAnalyzer.cs#L34

Dereference of a possibly null reference.

Publish AOT version: src/Heartbeat.Runtime/Analyzers/TimerQueueTimerAnalyzer.cs#L47

Dereference of a possibly null reference.

Publish AOT version: src/Heartbeat.Runtime/Analyzers/ServicePointManagerAnalyzer.cs#L31

Dereference of a possibly null reference.

Publish AOT version: src/Heartbeat.Runtime/Analyzers/ServicePointManagerAnalyzer.cs#L32

Dereference of a possibly null reference.

Publish AOT version: src/Heartbeat.Runtime/Extensions/ClrValueTypeExtensions.cs#L130

Dereference of a possibly null reference.

Publish AOT version: src/Heartbeat.Runtime/Analyzers/HttpWebResponseAnalyzer.cs#L32

Dereference of a possibly null reference.

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