Bump xunit from 2.6.5 to 2.6.6 (#213)

Bumps [xunit](https://github.com/xunit/xunit) from 2.6.5 to 2.6.6.
- [Commits](xunit/xunit@2.6.5...2.6.6)

---
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>

integration/Dunet.Integration.csproj

@@ -11,7 +11,7 @@
  <PackageReference Include="Dunet" Version="1.11.0" />
  <PackageReference Include="FluentAssertions" Version="6.12.0" />
  <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
- <PackageReference Include="xunit" Version="2.6.5" />
+ <PackageReference Include="xunit" Version="2.6.6" />
  <PackageReference Include="xunit.runner.visualstudio" Version="2.5.6">
  <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
  <PrivateAssets>all</PrivateAssets>

test/Dunet.Test.csproj

@@ -10,7 +10,7 @@
  <ItemGroup>
  <PackageReference Include="FluentAssertions" Version="6.12.0" />
  <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
- <PackageReference Include="xunit" Version="2.6.5" />
+ <PackageReference Include="xunit" Version="2.6.6" />
  <PackageReference Include="xunit.runner.visualstudio" Version="2.5.6">
  <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
  <PrivateAssets>all</PrivateAssets>