Bump xunit.runner.visualstudio from 2.5.6 to 2.5.7 (#536)

Bumps [xunit.runner.visualstudio](https://github.com/xunit/visualstudio.xunit) from 2.5.6 to 2.5.7.
- [Release notes](https://github.com/xunit/visualstudio.xunit/releases)
- [Commits](xunit/visualstudio.xunit@2.5.6...2.5.7)

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

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

Author: dependabot[bot]

Tests/Tests.csproj

@@ -8,7 +8,7 @@
     <PackageReference Include="FodyHelpers" Version="6.8.0" />
     <PackageReference Include="Xunit" Version="2.6.6" />
     <PackageReference Include="Verify.Xunit" Version="23.2.0" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.6" PrivateAssets="all" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.7" PrivateAssets="all" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
     <ProjectReference Include="..\AssemblyToProcess\AssemblyToProcess.csproj" />
     <ProjectReference Include="..\Caseless.Fody\Caseless.Fody.csproj" />