Update actions/cache action to v2 (#179)

Co-authored-by: Renovate Bot <[email protected]>

Author: renovate[bot]

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
         with:
           node-version: 14
       - name: Cache node modules
-        uses: actions/cache@v1
+        uses: actions/cache@v2
         with:
           path: node_modules
           key: ${{ runner.OS }}-build-${{ hashFiles('**/package-lock.json') }}