Bump xunit from 2.5.1 to 2.6.1 (#272)

Bumps [xunit](https://github.com/xunit/xunit) from 2.5.1 to 2.6.1.
- [Commits](xunit/xunit@2.5.1...2.6.1)

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

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

Author: dependabot[bot]

src/Directory.Packages.props

@@ -15,7 +15,7 @@
   <!-- Test dependencies -->
   <ItemGroup>
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
-    <PackageVersion Include="xunit" Version="2.5.1" />
+    <PackageVersion Include="xunit" Version="2.6.1" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="2.5.0" />
     <PackageVersion Include="FluentAssertions" Version="6.12.0" />
     <PackageVersion Include="Akka.TestKit.Xunit2" Version="$(AkkaVersion)" />