Update actions/setup-node action to v2 (#29)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

Author: renovate[bot]

.github/workflows/packages.yml

@@ -21,7 +21,7 @@ jobs:
         working-directory: packages
     steps:
       - uses: actions/checkout@v2
-      - uses: actions/setup-node@v1
+      - uses: actions/setup-node@v2
         with:
           node-version: 12
       - run: yarn install