Bump xunit from 2.6.1 to 2.6.2 (#310)

Bumps [xunit](https://github.com/xunit/xunit) from 2.6.1 to 2.6.2.
- [Commits](xunit/xunit@2.6.1...2.6.2)

---
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>
Co-authored-by: Steve Smith <steve@kentsmiths.com>

test/GuardClauses.UnitTests/GuardClauses.UnitTests.csproj

@@ -19,7 +19,7 @@
 
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.7.2" />
         <PackageReference Include="ReportGenerator" Version="5.2.0" />
-        <PackageReference Include="xunit" Version="2.6.1" />
+        <PackageReference Include="xunit" Version="2.6.2" />
         <PackageReference Include="xunit.runner.visualstudio" Version="2.5.4" />
 
     </ItemGroup>