Bump Verify.DiffPlex from 3.0.0 to 3.1.0 in /src

Bumps Verify.DiffPlex from 3.0.0 to 3.1.0.

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

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

src/Directory.Packages.props

@@ -12,7 +12,7 @@
     <PackageVersion Include="Polyfill" Version="5.6.0" />
     <PackageVersion Include="ProjectDefaults" Version="1.0.128" />
     <PackageVersion Include="Verify" Version="25.3.0" />
-    <PackageVersion Include="Verify.DiffPlex" Version="3.0.0" />
+    <PackageVersion Include="Verify.DiffPlex" Version="3.1.0" />
     <PackageVersion Include="Verify.Nunit" Version="25.3.0" />
   </ItemGroup>
 </Project>