ci: bump actions/checkout to v4 (#35)

Author: dizer-ti

.github/workflows/checks.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout the repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Setup
         uses: ./.github/actions/setup