Update dependency xunit to 2.9.1 (#747)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

src/Directory.Build.props

@@ -49,7 +49,7 @@
           <PrivateAssets>all</PrivateAssets>
         </PackageReference>
         <PackageReference Include="xunit">
-          <Version>2.9.0</Version>
+          <Version>2.9.1</Version>
         </PackageReference>
         <PackageReference Include="Xunit.SkippableFact" Version="1.4.13" />
         <PackageReference Include="coverlet.msbuild" Version="6.0.2">