Upgrade checkout

Author: shengy90

.github/workflows/lint_and_test.yaml

@@ -6,7 +6,7 @@ jobs:
   lint_and_test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: actions/setup-python@v2
         id: setup-python
         with: