Bump the dotnet group across 1 directory with 3 updates

Bumps the dotnet group with 3 updates in the /docs/core/testing/snippets/order-unit-tests/csharp/MSTest.Project directory: [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 6.0.2 to 6.0.4
- [Release notes](https://github.com/coverlet-coverage/coverlet/releases)
- [Commits](coverlet-coverage/coverlet@v6.0.2...v6.0.4)

Updates `MSTest.TestAdapter` from 3.6.3 to 3.7.3
- [Release notes](https://github.com/microsoft/testfx/releases)
- [Changelog](https://github.com/microsoft/testfx/blob/main/docs/Changelog.md)
- [Commits](microsoft/testfx@v3.6.3...v3.7.3)

Updates `MSTest.TestFramework` from 3.6.3 to 3.7.3
- [Release notes](https://github.com/microsoft/testfx/releases)
- [Changelog](https://github.com/microsoft/testfx/blob/main/docs/Changelog.md)
- [Commits](microsoft/testfx@v3.6.3...v3.7.3)

---
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-minor
  dependency-group: dotnet
- dependency-name: MSTest.TestFramework
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: dotnet
...

Signed-off-by: dependabot[bot] <support@github.com>

docs/core/testing/snippets/order-unit-tests/csharp/MSTest.Project/MSTest.Project.csproj

@@ -9,9 +9,9 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
-    <PackageReference Include="MSTest.TestAdapter" Version="3.6.3" />
-    <PackageReference Include="MSTest.TestFramework" Version="3.6.3" />
-    <PackageReference Include="coverlet.collector" Version="6.0.2">
+    <PackageReference Include="MSTest.TestAdapter" Version="3.7.3" />
+    <PackageReference Include="MSTest.TestFramework" Version="3.7.3" />
+    <PackageReference Include="coverlet.collector" Version="6.0.4">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>