ci: use node 16 for tests and run prettier check (#452) [skip ci]

* ci: use node v16

* ci: use actions/cache@v2

* ci: run prettier check

* Revert "ci: run prettier check"

This reverts commit 0a6fd59.

Author: saihaj

.github/workflows/ci.yml

@@ -8,15 +8,15 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: [12.x, 14.x, 15.x]
+        node-version: [12.x, 14.x, 16.x]
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v2
         with:
           node-version: ${{ matrix.node-version }}
       - name: Cache node_modules
         id: cache-modules
-        uses: actions/cache@v1
+        uses: actions/cache@v2
         with:
           path: node_modules
           key: ${{ matrix.node-version }}-${{ runner.OS }}-build-${{ hashFiles('yarn.lock') }}