fix: install libffi-dev for Ditto SDK native library loading

Added libffi-dev dependency installation to resolve UnsatisfiedLinkError
with FFI symbols when loading Ditto SDK native libraries in Ubuntu CI.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: Teodor Ciuraru

.github/workflows/java-spring-browserstack.yml

@@ -30,6 +30,11 @@ jobs:
       - name: Setup Android SDK
         uses: ./.github/actions/android-sdk-setup
 
+      - name: Install FFI dependencies for Ditto SDK
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y libffi-dev
+
       - name: Setup Ditto Environment
         uses: ./.github/actions/ditto-env-setup
         with: