build(deps): bump SQLitePCLRaw.core from 2.1.5 to 2.1.6 in /src (#863)

Bumps [SQLitePCLRaw.core](https://github.com/ericsink/SQLitePCL.raw) from 2.1.5 to 2.1.6.
- [Release notes](https://github.com/ericsink/SQLitePCL.raw/releases)
- [Commits](ericsink/SQLitePCL.raw@v2.1.5...v2.1.6)

---
updated-dependencies:
- dependency-name: SQLitePCLRaw.core
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

src/Akavache.Sqlite3/Akavache.Sqlite3.csproj

@@ -18,7 +18,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="SQLitePCLRaw.core" Version="2.1.5" />
+    <PackageReference Include="SQLitePCLRaw.core" Version="2.1.6" />
     <PackageReference Include="System.Reactive" Version="6.0.0" />
     <PackageReference Include="Splat" Version="14.*" />
   </ItemGroup>