Bump Xunit from 2.5.0 to 2.5.1 (#480)

Bumps [Xunit](https://github.com/xunit/xunit) from 2.5.0 to 2.5.1.
- [Commits](xunit/xunit@2.5.0...2.5.1)

---
updated-dependencies:
- dependency-name: Xunit
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Tests/Tests.csproj

@@ -7,7 +7,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.CSharp" Version="4.7.0" />
     <PackageReference Include="FodyHelpers" Version="6.8.0" />
-    <PackageReference Include="Xunit" Version="2.5.0" />
+    <PackageReference Include="Xunit" Version="2.5.1" />
     <PackageReference Include="Verify.Xunit" Version="21.1.3" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.5.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.7.2" />