build(deps): bump DiffEngine from 6.9.1 to 6.9.2 in /src (#728)

Bumps [DiffEngine](https://github.com/VerifyTests/DiffEngine) from 6.9.1 to 6.9.2.
- [Release notes](https://github.com/VerifyTests/DiffEngine/releases)
- [Commits](VerifyTests/DiffEngine@6.9.1...6.9.2)

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

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

src/Directory.build.props

@@ -40,7 +40,7 @@
     <PackageReference Include="FluentAssertions" Version="5.10.3" />
     <PackageReference Include="Microsoft.Reactive.Testing" Version="5.0.0" />
     <PackageReference Include="PublicApiGenerator" Version="10.2.0" />
-    <PackageReference Include="DiffEngine" Version="6.9.1" />
+    <PackageReference Include="DiffEngine" Version="6.9.2" />
   </ItemGroup>
 
   <ItemGroup Condition="$(IsTestProject)">