Bump xunit from 2.9.0 to 2.9.1 (#31)

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

Author: dependabot[bot]

test/Directory.Packages.props

@@ -13,7 +13,7 @@
     <PackageVersion Include="NSubstitute" Version="5.1.0" />
     <PackageVersion Include="System.Linq.Async" Version="6.0.1" />
     <PackageVersion Include="System.Reactive" Version="6.0.1" />
-    <PackageVersion Include="xunit" Version="2.9.0" />
+    <PackageVersion Include="xunit" Version="2.9.1" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="2.8.2" />
   </ItemGroup>
 </Project>