Bump the dotnet group (#46027)

Bumps the dotnet group in /docs/core/diagnostics/snippets/Microsoft.Diagnostics.NETCore.Client/csharp with 2 updates: [Microsoft.Diagnostics.NETCore.Client](https://github.com/dotnet/diagnostics) and [Microsoft.Diagnostics.Tracing.TraceEvent](https://github.com/Microsoft/perfview).


Updates `Microsoft.Diagnostics.NETCore.Client` from 0.2.621003 to 0.2.510501
- [Release notes](https://github.com/dotnet/diagnostics/releases)
- [Commits](https://github.com/dotnet/diagnostics/commits)

Updates `Microsoft.Diagnostics.Tracing.TraceEvent` from 3.1.20 to 3.1.21
- [Release notes](https://github.com/Microsoft/perfview/releases)
- [Commits](microsoft/perfview@v3.1.20...v3.1.21)

---
updated-dependencies:
- dependency-name: Microsoft.Diagnostics.NETCore.Client
  dependency-version: 0.2.510501
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: dotnet
- dependency-name: Microsoft.Diagnostics.Tracing.TraceEvent
  dependency-version: 3.1.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: dotnet
...

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Author: dependabot[bot]

docs/core/diagnostics/snippets/Microsoft.Diagnostics.NETCore.Client/csharp/Microsoft.Diagnostics.NETCore.Client.Samples.csproj

@@ -7,7 +7,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.Diagnostics.NETCore.Client" Version="0.2.621003" />
-    <PackageReference Include="Microsoft.Diagnostics.Tracing.TraceEvent" Version="3.1.20" />
+    <PackageReference Include="Microsoft.Diagnostics.Tracing.TraceEvent" Version="3.1.21" />
   </ItemGroup>
 
 </Project>