Bump xunit from 2.6.6 to 2.7.0 (#21)

Bumps [xunit](https://github.com/xunit/xunit) from 2.6.6 to 2.7.0.
- [Commits](https://github.com/xunit/xunit/compare/2.6.6...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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

GlennLibTests/GlennLibTests.csproj

@@ -12,7 +12,7 @@
     <ItemGroup>
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
         <PackageReference Include="SixLabors.ImageSharp" Version="3.1.2" />
-        <PackageReference Include="xunit" Version="2.6.6" />
+        <PackageReference Include="xunit" Version="2.7.0" />
         <PackageReference Include="xunit.runner.visualstudio" Version="2.5.7">
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
             <PrivateAssets>all</PrivateAssets>