Bump the dotnet group

Bumps the dotnet group in /docs/core/tutorials/snippets/library-with-visual-studio/csharp/StringLibraryTestNet8 with 3 updates: [coverlet.collector](https://github.com/coverlet-coverage/coverlet), [MSTest.TestAdapter](https://github.com/microsoft/testfx) and [MSTest.TestFramework](https://github.com/microsoft/testfx).


Updates `coverlet.collector` from 6.0.3 to 6.0.4
- [Release notes](https://github.com/coverlet-coverage/coverlet/releases)
- [Commits](coverlet-coverage/coverlet@v6.0.3...v6.0.4)

Updates `MSTest.TestAdapter` from 3.7.1 to 3.7.2
- [Release notes](https://github.com/microsoft/testfx/releases)
- [Changelog](https://github.com/microsoft/testfx/blob/main/docs/Changelog.md)
- [Commits](microsoft/testfx@v3.7.1...v3.7.2)

Updates `MSTest.TestFramework` from 3.7.1 to 3.7.2
- [Release notes](https://github.com/microsoft/testfx/releases)
- [Changelog](https://github.com/microsoft/testfx/blob/main/docs/Changelog.md)
- [Commits](microsoft/testfx@v3.7.1...v3.7.2)

---
updated-dependencies:
- dependency-name: coverlet.collector
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: dotnet
- dependency-name: MSTest.TestAdapter
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: dotnet
- dependency-name: MSTest.TestFramework
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: dotnet
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

docs/core/tutorials/snippets/library-with-visual-studio/csharp/StringLibraryTestNet8/StringLibraryTest.csproj

@@ -11,9 +11,9 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
-    <PackageReference Include="MSTest.TestAdapter" Version="3.7.1" />
-    <PackageReference Include="MSTest.TestFramework" Version="3.7.1" />
-    <PackageReference Include="coverlet.collector" Version="6.0.3" />
+    <PackageReference Include="MSTest.TestAdapter" Version="3.7.2" />
+    <PackageReference Include="MSTest.TestFramework" Version="3.7.2" />
+    <PackageReference Include="coverlet.collector" Version="6.0.4" />
   </ItemGroup>
 
   <ItemGroup>