Bump Verify.Xunit from 28.1.2 to 28.1.3 in /src (#556)

Author: dependabot[bot]

src/Directory.Packages.props

@@ -25,7 +25,7 @@
     <PackageVersion Include="Verify.DiffPlex" Version="3.1.2" />
     <PackageVersion Include="Verify.ImageMagick" Version="3.6.0" />
     <PackageVersion Include="Verify.WinForms" Version="4.0.0" />
-    <PackageVersion Include="Verify.Xunit" Version="28.1.2" />
+    <PackageVersion Include="Verify.Xunit" Version="28.1.3" />
     <PackageVersion Include="Xunit" Version="2.9.2" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="3.0.0-pre.42" />
     <PackageVersion Include="XunitContext" Version="3.3.2" />