chore(deps): update dependency verify.xunit to v28

Author: renovate[bot]

Diff for: src/Directory.Packages.props

@@ -33,7 +33,7 @@
     <PackageVersion Include="stylecop.analyzers" Version="1.2.0-beta.556" />
     <PackageVersion Include="System.Collections.Immutable" Version="8.0.0" />
     <PackageVersion Include="System.Threading.Tasks.Extensions" Version="4.5.4" />
-    <PackageVersion Include="Verify.Xunit" Version="26.4.4" />
+    <PackageVersion Include="Verify.Xunit" Version="28.6.1" />
     <PackageVersion Include="xunit" Version="2.9.0" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="2.8.2" />
     <PackageVersion Include="xunit.runner.devices" Version="2.5.25" />