Bump xunit from 2.5.1 to 2.7.0

Bumps [xunit](https://github.com/xunit/xunit) from 2.5.1 to 2.7.0.
- [Commits](xunit/xunit@2.5.1...2.7.0)

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

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

tests/Chisel.Tests.csproj

@@ -14,7 +14,7 @@
     <PackageReference Include="PublicApiGenerator" Version="11.0.0" />
     <PackageReference Include="ReportGenerator" Version="5.1.25" PrivateAssets="all" />
     <PackageReference Include="Verify.Xunit" Version="21.2.0" />
-    <PackageReference Include="xunit" Version="2.5.1" />
+    <PackageReference Include="xunit" Version="2.7.0" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.5.1" PrivateAssets="all" />
   </ItemGroup>