Update actions/cache action to v3

Author: renovate[bot]

.github/workflows/check.yml

@@ -18,7 +18,7 @@ jobs:
           node-version: "16.x"
 
       - name: Cache dependencies
-        uses: actions/cache@v2
+        uses: actions/cache@v3
         with:
           path: ~/.npm
           key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}

.github/workflows/demo.yml

@@ -17,7 +17,7 @@ jobs:
           node-version: "16.x"
 
       - name: Cache dependencies
-        uses: actions/cache@v2
+        uses: actions/cache@v3
         with:
           path: ~/.npm
           key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}