Bump coverlet.collector (#44132)

Bumps the dotnet group in /docs/core/tutorials/snippets/library-with-visual-studio/csharp/StringLibraryTestNet8 with 1 update: [coverlet.collector](https://github.com/coverlet-coverage/coverlet).


Updates `coverlet.collector` from 6.0.2 to 6.0.3
- [Release notes](https://github.com/coverlet-coverage/coverlet/releases)
- [Commits](coverlet-coverage/coverlet@v6.0.2...v6.0.3)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

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

@@ -13,7 +13,7 @@
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <PackageReference Include="MSTest.TestAdapter" Version="3.7.0" />
     <PackageReference Include="MSTest.TestFramework" Version="3.7.0" />
-    <PackageReference Include="coverlet.collector" Version="6.0.2" />
+    <PackageReference Include="coverlet.collector" Version="6.0.3" />
   </ItemGroup>
 
   <ItemGroup>