Bump coverlet.collector from 6.0.2 to 6.0.3 in /hello-grpc-csharp

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

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

Author: dependabot[bot]

Diff for: hello-grpc-csharp/HelloUT/HelloUT.csproj

@@ -18,7 +18,7 @@
         <!-- https://www.nuget.org/packages/NUnit.Analyzers -->
         <PackageReference Include="NUnit.Analyzers" Version="4.5.0" />
         <!-- https://www.nuget.org/packages/coverlet.collector -->
-        <PackageReference Include="coverlet.collector" Version="6.0.2" />
+        <PackageReference Include="coverlet.collector" Version="6.0.3" />
         <ProjectReference Include="..\Common\Common.csproj" />
     </ItemGroup>