Bump xunit from 2.6.5 to 2.6.6 (#1112)

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Author: dependabot[bot]

Tests.props

@@ -15,7 +15,7 @@
  <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.3.3" Condition="'$(TargetFramework)' == 'netcoreapp2.1'" />
  <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" Condition="'$(TargetFramework)' != 'netcoreapp2.1'" />
  <PackageReference Include="Shouldly" Version="4.2.1" />
- <PackageReference Include="xunit" Version="2.6.5" />
+ <PackageReference Include="xunit" Version="2.6.6" />
  <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3" Condition="'$(TargetFramework)' == 'netcoreapp2.1'" />
  <PackageReference Include="xunit.runner.visualstudio" Version="2.4.5" Condition="'$(TargetFramework)' == 'netcoreapp3.1' OR '$(TargetFramework)' == 'net5.0'" />
  <PackageReference Include="xunit.runner.visualstudio" Version="2.5.6" Condition="'$(TargetFramework)' != 'netcoreapp2.1' AND '$(TargetFramework)' != 'netcoreapp3.1' AND '$(TargetFramework)' != 'net5.0'" />