Update KubernetesClient DiagnosticSource dependency

[WeihanLi]

System.Diagnostics.DiagnosticSource has been included in the framework reference, no need to reference for net8

fixes #1553

[tg123]

so this is net6 only?

we already moved to net8 lol

[WeihanLi]

Yeah, the System.Diagnostics.DiagnosticSource is included in the shared framework, so there's no need to reference this package for most cases.

While we're using the UpDownCounter in the code

csharp/src/KubernetesClient/PrometheusHandler.cs

Line 33 in 2c2bd6a

private static readonly UpDownCounter<int> ActiveRequests =

The UpDownCounter has been introduced since .NET 7
see the API: https://apisof.net/catalog/c7f52491f5c19b75d271677fe9123886

The shared framework for .NET 6 only has the 6.0.x reference which does not support this UpDownCounter, so we had to add a reference explicitly.

For .NET 7 and later frameworks, we could use the framework reference directly, so no need to add the reference for System.Diagnostics.DiagnosticSource when targeting net8.0 I think

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[tg123]

/LGTM

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