chore(deps): update actions/setup-node action to v4 (#31)

Co-authored-by: versionvanguard[bot] <149176998+versionvanguard[bot]@users.noreply.github.com>

Author: versionvanguard[bot]

.github/workflows/firebase-hosting-merge.yml

@@ -13,7 +13,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: Use Node.js
-        uses: actions/setup-node@v2
+        uses: actions/setup-node@v4
         with:
           node-version-file: '.node-version'
       - name: Cache node modules

.github/workflows/firebase-hosting-pull-request.yml

@@ -11,7 +11,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: Use Node.js
-        uses: actions/setup-node@v2
+        uses: actions/setup-node@v4
         with:
           node-version-file: '.node-version'
       - name: Cache node modules