Update actions/checkout to v3

Author: wrt54g

.github/workflows/licensed.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     name: Check licenses
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Set Node.js 16.x
         uses: actions/setup-node@v3
         with: