build(deps): bump DiffEngine from 15.0.1 to 15.2.0 in /src (#893)

Bumps [DiffEngine](https://github.com/VerifyTests/DiffEngine) from 15.0.1 to 15.2.0.
- [Release notes](https://github.com/VerifyTests/DiffEngine/releases)
- [Commits](https://github.com/VerifyTests/DiffEngine/commits/15.2.0)

---
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

@@ -23,7 +23,7 @@
     <PackageReference Include="System.Net.Http" Version="4.3.4" />
     <PackageReference Include="SQLitePCLRaw.bundle_e_sqlite3" Version="2.1.7" />
     <PackageReference Include="FluentAssertions" Version="6.12.0" />
-    <PackageReference Include="DiffEngine" Version="15.0.1" />
+    <PackageReference Include="DiffEngine" Version="15.2.0" />
     <PackageReference Include="PublicApiGenerator" Version="11.1.0" />
     <PackageReference Include="Verify.Xunit" Version="22.6.0" />
     <PackageReference Include="coverlet.msbuild" Version="6.0.0">