Bump Verify.DiffPlex from 2.3.0 to 3.1.2

---
updated-dependencies:
- dependency-name: Verify.DiffPlex
  dependency-version: 3.1.2
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

src/Akka.Hosting.API.Tests/Akka.Hosting.API.Tests.csproj

@@ -19,7 +19,7 @@
         </PackageReference>
         <PackageReference Include="PublicApiGenerator" Version="11.1.0" />
         <PackageReference Include="Verify.Xunit" Version="22.11.1" />
-        <PackageReference Include="Verify.DiffPlex" Version="2.3.0" />
+        <PackageReference Include="Verify.DiffPlex" Version="3.1.2" />
     </ItemGroup>
 
     <ItemGroup>