build(deps): bump DiffEngine from 11.2.0 to 11.4.0 in /src (#846)

Bumps [DiffEngine](https://github.com/VerifyTests/DiffEngine) from 11.2.0 to 11.4.0.
- [Release notes](https://github.com/VerifyTests/DiffEngine/releases)
- [Commits](VerifyTests/DiffEngine@11.2.0...11.4.0)

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

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

src/Akavache.Tests/Akavache.Tests.csproj

@@ -19,7 +19,7 @@
     <PackageReference Include="System.Net.Http" Version="4.3.4" />
     <PackageReference Include="SQLitePCLRaw.bundle_e_sqlite3" Version="2.1.5" />
     <PackageReference Include="FluentAssertions" Version="6.10.0" />
-    <PackageReference Include="DiffEngine" Version="11.2.0" />
+    <PackageReference Include="DiffEngine" Version="11.4.0" />
     <PackageReference Include="PublicApiGenerator" Version="11.0.0" />
     <PackageReference Include="coverlet.msbuild" Version="3.2.0">
       <PrivateAssets>all</PrivateAssets>