Update actions/checkout action to v4

renovate[bot] · web-flow · commit d35b2bd75b7a · 2023-10-19T11:17:10.000Z
diff --git a/.github/workflows/format_rst.yml b/.github/workflows/format_rst.yml
@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Set up Python
         uses: actions/setup-python@v4
