chore(deps): bump DiffEngine from 8.5.3 to 9.0.6 in /src (#217)

Bumps [DiffEngine](https://github.com/VerifyTests/DiffEngine) from 8.5.3 to 9.0.6.
- [Release notes](https://github.com/VerifyTests/DiffEngine/releases)
- [Commits](VerifyTests/DiffEngine@8.5.3...9.0.6)

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

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

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

src/Directory.build.props

@@ -36,7 +36,7 @@
     <PackageReference Include="Xunit.SkippableFact" Version="1.4.13" />
     <PackageReference Include="Xunit.StaFact" Version="1.1.11" />
     <PackageReference Include="FluentAssertions" Version="6.4.0" />
-    <PackageReference Include="DiffEngine" Version="8.5.3" />
+    <PackageReference Include="DiffEngine" Version="9.0.6" />
     <PackageReference Include="PublicApiGenerator" Version="10.3.0" />
     <PackageReference Include="coverlet.msbuild" Version="3.1.2">
       <PrivateAssets>all</PrivateAssets>