fix(ios): fix error on ci due to errno::EEXIST - File exists @ syserr…

…_fail2_in

The reason for the issue seems to be a bug in cocoapods < 15.2
See facebook/react-native#42698

.github/workflows/ios-ci.yml

@@ -26,6 +26,8 @@ jobs:
       - name: Install example npm dependencies
         run: yarn example --frozen-lockfile
         shell: bash
+      - name: Install Ruby gems
+        run: gem install cocoapods -v 1.15.2
       - name: Install Pods
         run: ${{matrix.extraEnv}} pod install
         working-directory: example/ios