Bump actions/cache from v1 to v2.1.1

Bumps [actions/cache](https://github.com/actions/cache) from v1 to v2.1.1.
- [Release notes](https://github.com/actions/cache/releases)
- [Commits](actions/cache@v1...5ca27f2)

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/nodejs.yml

@@ -17,7 +17,7 @@ jobs:
       uses: actions/setup-node@v1
       with:
         node-version: ${{ matrix.node-version }}
-    - uses: actions/cache@v1
+    - uses: actions/cache@v2.1.1
       with:
         path: ~/.npm
         key: ${{ runner.os }}-${{ matrix.node-version }}-node-${{ hashFiles('**/package-lock.json') }}