build(deps): bump coverlet.collector

Bumps the phonenumbers_extensions_test_minor_patch_updates group in /csharp/PhoneNumbers.Extensions.Test 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: phonenumbers_extensions_test_minor_patch_updates
...

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

csharp/PhoneNumbers.Extensions.Test/PhoneNumbers.Extensions.Test.csproj

@@ -21,7 +21,7 @@
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
             <PrivateAssets>all</PrivateAssets>
         </PackageReference>
-        <PackageReference Include="coverlet.collector" Version="6.0.2">
+        <PackageReference Include="coverlet.collector" Version="6.0.3">
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
             <PrivateAssets>all</PrivateAssets>
         </PackageReference>