Update xunit.skippablefact to 1.3.6

Author: bording

LibGit2Sharp.Tests/LibGit2Sharp.Tests.csproj

@@ -17,7 +17,7 @@
     <PackageReference Include="xunit" Version="2.4.0" />
     <PackageReference Include="xunit.runner.console" Version="2.4.0" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.0" />
-    <PackageReference Include="xunit.skippablefact" Version="1.3.3" />
+    <PackageReference Include="xunit.skippablefact" Version="1.3.6" />
   </ItemGroup>
 
   <ItemGroup>