build(deps): bump DiffEngine from 8.4.0 to 8.4.1 in /src (#739)

Bumps [DiffEngine](https://github.com/VerifyTests/DiffEngine) from 8.4.0 to 8.4.1.
- [Release notes](https://github.com/VerifyTests/DiffEngine/releases)
- [Commits](VerifyTests/DiffEngine@8.4.0...8.4.1)

---
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/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="2.0.7" />
     <PackageReference Include="FluentAssertions" Version="6.2.0" />
-    <PackageReference Include="DiffEngine" Version="8.4.0" />
+    <PackageReference Include="DiffEngine" Version="8.4.1" />
     <PackageReference Include="PublicApiGenerator" Version="10.2.0" />
     <PackageReference Include="coverlet.msbuild" Version="3.1.0">
       <PrivateAssets>all</PrivateAssets>