Chore: use actions/setup-node@v2

it's as the same as we have done in the eslint repo: eslint/eslint#14816

.github/workflows/ci.yml

@@ -36,7 +36,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v2
-    - uses: actions/setup-node@v1
+    - uses: actions/setup-node@v2
       with:
         node-version: ${{ matrix.node }}
     - name: Install dependencies