Bump Verify.DiffPlex from 1.3.0 to 2.0.0 (#6210)

Bumps [Verify.DiffPlex](https://github.com/VerifyTests/Verify.DiffPlex) from 1.3.0 to 2.0.0.
- [Release notes](https://github.com/VerifyTests/Verify.DiffPlex/releases)
- [Commits](https://github.com/VerifyTests/Verify.DiffPlex/commits)

---
updated-dependencies:
- dependency-name: Verify.DiffPlex
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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src/core/Akka.API.Tests/Akka.API.Tests.csproj

@@ -29,7 +29,7 @@
     <PackageReference Include="xunit.runner.visualstudio" Version="$(XunitVersion)" />
     <PackageReference Include="PublicApiGenerator" Version="9.3.0" />
     <PackageReference Include="Verify.Xunit" Version="18.0.0" />
-    <PackageReference Include="Verify.DiffPlex" Version="1.3.0" />
+    <PackageReference Include="Verify.DiffPlex" Version="2.0.0" />
   </ItemGroup>
 
 </Project>