chore(deps): update actions/cache action to v4 (#25)

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

Author: versionvanguard[bot]

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

@@ -19,7 +19,7 @@ jobs:
         with:
           node-version: ${{ env.NODE_VERSION }}
       - name: Cache node modules
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         env:
           cache-name: cache-node-modules
         with:

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

@@ -15,7 +15,7 @@ jobs:
         with:
           node-version: ${{ env.NODE_VERSION }}
       - name: Cache node modules
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         env:
           cache-name: cache-node-modules
         with: