Update actions/checkout action to v3 (#18)

Co-authored-by: Renovate Bot <[email protected]>

Author: renovate[bot]

.github/workflows/linter.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Use Node.js
       uses: actions/setup-node@v2
     - run: npm install