chore(deps): update actions/checkout action to v4

Author: renovate[bot]

.github/workflows/weekly-poetry-bot.yml

@@ -10,7 +10,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: Set up Python
       uses: actions/setup-python@v5