Update actions/checkout action to v2

Author: renovate-bot

.github/workflows/test.yml

@@ -14,7 +14,7 @@ jobs:
       FORCE_COLOR: 1
     name: Node ${{ matrix.node }}
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v2
       - uses: actions/setup-node@v1
         with:
           node-version: ${{ matrix.node }}