build(deps): Bump coverlet.collector from 6.0.3 to 6.0.4

Bumps [coverlet.collector](https://github.com/coverlet-coverage/coverlet) 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)

---
updated-dependencies:
- dependency-name: coverlet.collector
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

src/Xdg.Testing/Xdg.Testing.csproj

@@ -15,7 +15,7 @@
 		<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="coverlet.collector" Version="6.0.4" />
 	</ItemGroup>
 
 	<ItemGroup>