Update actions/setup-node action to v4 (#237)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/firebase_functions.yml

@@ -14,7 +14,7 @@ jobs:
         working-directory: firebase/functions
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/setup-node@v3
+      - uses: actions/setup-node@v4
         with:
           node-version: 16.x
       - uses: actions/cache@v3