chore(buildtools): Use fixed version of cocoapods gem on ci (#1006)

install exact version instead of latest one

.github/workflows/detox.yml

       - name: Setup - Install NPM Dependencies
         run: yarn
       - name: Setup - Install CocoaPods CLI
-        run: sudo gem install cocoapods
+        run: sudo gem install cocoapods -v 1.8.4
       - name: Run tests
         run: yarn ci