chore(deps): update actions/checkout action to v7

Author: renovate[bot]

.github/workflows/pullfrog.yml

@@ -22,7 +22,7 @@ jobs:
       contents: read
     steps:
       - name: Checkout code
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
         with:
           fetch-depth: 1
       - name: Run agent