build(deps): bump DiffEngine from 7.2.1 to 7.3.0 in /src (#775)

Bumps [DiffEngine](https://github.com/VerifyTests/DiffEngine) from 7.2.1 to 7.3.0.
- [Release notes](https://github.com/VerifyTests/DiffEngine/releases)
- [Commits](https://github.com/VerifyTests/DiffEngine/commits/7.3.0)

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

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

src/Directory.build.props

@@ -41,7 +41,7 @@
     <PackageReference Include="FluentAssertions" Version="6.1.0" />
     <PackageReference Include="Microsoft.Reactive.Testing" Version="5.0.0" />
     <PackageReference Include="PublicApiGenerator" Version="10.2.0" />
-    <PackageReference Include="DiffEngine" Version="7.2.1" />
+    <PackageReference Include="DiffEngine" Version="7.3.0" />
   </ItemGroup>
 
   <ItemGroup Condition="$(IsTestProject)">