Bump xunit.runner.visualstudio from 2.5.7 to 2.8.0

Bumps [xunit.runner.visualstudio](https://github.com/xunit/visualstudio.xunit) from 2.5.7 to 2.8.0.
- [Release notes](https://github.com/xunit/visualstudio.xunit/releases)
- [Commits](xunit/visualstudio.xunit@2.5.7...2.8.0)

---
updated-dependencies:
- dependency-name: xunit.runner.visualstudio
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

test/UnitTests/UnitTests.csproj

@@ -22,7 +22,7 @@
         <PackageReference Include="MSTest.TestFramework" Version="3.2.2" />
         <PackageReference Include="xunit" Version="2.7.0" />
         <PackageReference Include="xunit.analyzers" Version="1.11.0" />
-        <PackageReference Include="xunit.runner.visualstudio" Version="2.5.7">
+        <PackageReference Include="xunit.runner.visualstudio" Version="2.8.0">
             <PrivateAssets>all</PrivateAssets>
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
         </PackageReference>