chore: update cache key

Author: horike37

.github/workflows/push.yml

@@ -15,9 +15,9 @@ jobs:
         uses: actions/cache@v2
         with:
           path: ~/.npm
-          key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
+          key: ${{ runner.os }}-sls-${{ hashFiles('**/package-lock.json') }}
           restore-keys: |
-            ${{ runner.os }}-node-
+            ${{ runner.os }}-sls-
       - run: npm install
       - run: npm run lint
       - run: npm run coverage