deps: update dependency xunit to v2.5.0

Author: renovate[bot]

Directory.Packages.props

@@ -17,7 +17,7 @@
     <PackageVersion Include="FsCheck" Version="2.16.6" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.6.3" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="2.5.0" />
-    <PackageVersion Include="xunit" Version="2.4.2" />
+    <PackageVersion Include="xunit" Version="2.5.0" />
   </ItemGroup>
 
 </Project>