Bump Verify.DiffPlex from 3.1.1 to 3.1.2 in /src

Bumps [Verify.DiffPlex](https://github.com/VerifyTests/Verify.DiffPlex) from 3.1.1 to 3.1.2.
- [Release notes](https://github.com/VerifyTests/Verify.DiffPlex/releases)
- [Commits](VerifyTests/Verify.DiffPlex@3.1.1...3.1.2)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

src/Directory.Packages.props

@@ -11,7 +11,7 @@
     <PackageVersion Include="ProjectDefaults" Version="1.0.139" />
     <PackageVersion Include="SixLabors.ImageSharp" Version="3.1.5" />
     <PackageVersion Include="Verify" Version="27.0.0" />
-    <PackageVersion Include="Verify.DiffPlex" Version="3.1.1" />
+    <PackageVersion Include="Verify.DiffPlex" Version="3.1.2" />
     <PackageVersion Include="Verify.Nunit" Version="27.0.0" />
   </ItemGroup>
 </Project>