Bump the tests group across 1 directory with 3 updates

Bumps the tests group with 3 updates in the / directory: [coverlet.collector](https://github.com/coverlet-coverage/coverlet), [xunit](https://github.com/xunit/xunit) and [xunit.runner.visualstudio](https://github.com/xunit/visualstudio.xunit).


Updates `coverlet.collector` from 6.0.0 to 6.0.2
- [Release notes](https://github.com/coverlet-coverage/coverlet/releases)
- [Commits](coverlet-coverage/coverlet@v6.0.0...v6.0.2)

Updates `xunit` from 2.5.0 to 2.8.1
- [Commits](xunit/xunit@2.5.0...2.8.1)

Updates `xunit.runner.visualstudio` from 2.5.0 to 2.8.1
- [Release notes](https://github.com/xunit/visualstudio.xunit/releases)
- [Commits](xunit/visualstudio.xunit@2.5.0...2.8.1)

---
updated-dependencies:
- dependency-name: coverlet.collector
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: tests
- dependency-name: xunit
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: tests
- dependency-name: xunit.runner.visualstudio
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: tests
...

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

src/Tests/Tests.csproj

@@ -10,9 +10,9 @@
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.7.0" />
     <PackageReference Include="Microsoft.Orleans.TestingHost" Version="7.2.1" />
     <PackageReference Include="Moq" Version="4.20.70" />
-    <PackageReference Include="xunit" Version="2.5.0" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.0" />
-    <PackageReference Include="coverlet.collector" Version="6.0.0" />
+    <PackageReference Include="xunit" Version="2.8.1" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.8.1" />
+    <PackageReference Include="coverlet.collector" Version="6.0.2" />
     <PackageReference Include="Microsoft.Orleans.Client" Version="7.2.1" />
     <PackageReference Include="Microsoft.Orleans.Server" Version="7.2.6" />
   </ItemGroup>