Update dependency Verify.Xunit to 28.8.1

Author: renovate[bot]

src/Cake.Gradle.Tests/Cake.Gradle.Tests.csproj

@@ -27,7 +27,7 @@
           <PrivateAssets>all</PrivateAssets>
         </PackageReference>
         <PackageReference Include="Moq" Version="4.20.72" />
-        <PackageReference Include="Verify.Xunit" Version="28.7.0" />
+        <PackageReference Include="Verify.Xunit" Version="28.8.1" />
         <PackageReference Include="xunit" Version="2.9.2" />
         <PackageReference Include="xunit.analyzers" Version="1.18.0" />
         <PackageReference Include="xunit.runner.visualstudio" Version="3.0.0">