Bump xunit from 2.5.3 to 2.6.6 (#22)

Bumps [xunit](https://github.com/xunit/xunit) from 2.5.3 to 2.6.6.
- [Commits](xunit/xunit@2.5.3...2.6.6)

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

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

Author: dependabot[bot]

src/Destructurama.JsonNet.Tests/Destructurama.JsonNet.Tests.csproj

@@ -8,7 +8,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.7.2" />
-    <PackageReference Include="xunit" Version="2.5.3" />
+    <PackageReference Include="xunit" Version="2.6.6" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.5.3" />
     <PackageReference Include="Serilog" Version="2.12.0" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />