chore(deps): update dependency diffengine to v16

Author: renovate[bot]

src/Akavache.Tests/Akavache.Tests.csproj

@@ -24,7 +24,7 @@
     <PackageReference Include="System.Net.Http" Version="4.3.4" />
     <PackageReference Include="SQLitePCLRaw.bundle_e_sqlite3" Version="2.1.11" />
     <PackageReference Include="FluentAssertions" Version="8.2.0" />
-    <PackageReference Include="DiffEngine" Version="15.11.0" />
+    <PackageReference Include="DiffEngine" Version="16.2.1" />
     <PackageReference Include="PublicApiGenerator" Version="11.4.5" />
     <PackageReference Include="Verify.Xunit" Version="28.15.0" />
     <PackageReference Include="coverlet.msbuild" Version="6.0.4">