Update checks.yml

Author: annndruha

.github/workflows/checks.yml

@@ -8,7 +8,7 @@ jobs:
   linting:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@master
+      - uses: actions/checkout@v3
       - uses: actions/setup-python@v4
         with:
           python-version: 3.11