Update Xunit and Moq

tests/ImageSharp.Tests/ImageSharp.Tests.csproj

@@ -17,10 +17,10 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="CoreCompat.System.Drawing" Version="1.0.0-beta006" />
-    <PackageReference Include="xunit" Version="2.3.0-beta4-build3742" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.3.0-beta4-build3742" />
+    <PackageReference Include="xunit" Version="2.3.0" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.3.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.3.0" />
-    <PackageReference Include="Moq" Version="4.7.99" />
+    <PackageReference Include="Moq" Version="4.7.137" />
     <!--<PackageReference Include="StyleCop.Analyzers" Version="1.1.0-beta001">
       <PrivateAssets>All</PrivateAssets>
     </PackageReference>-->