fix(ci): correct Yarn 4 cache paths and add auto-merge for version PRs

- Fixed cache paths for Yarn 4 (node_modules + .yarn/install-state.gz)
- Updated all workflows to use actions/cache@v4
- Added auto-merge for WhatsApp version update PRs

https://claude.ai/code/session_01QPt4WssG6jjEciQKdVpFtK

.github/workflows/test.yml

@@ -36,10 +36,12 @@ jobs:
           git config --global url."https://x-access-token:${GITHUB_TOKEN}@github.com/".insteadOf "https://github.com/"
 
       - name: Restore Yarn Cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         id: yarn-cache
         with:
-          path: .yarn/cache
+          path: |
+            node_modules
+            .yarn/install-state.gz
           key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
           restore-keys: |
             ${{ runner.os }}-yarn-