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

Author: renovate[bot]

.github/workflows/premerge.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
 
     - uses: actions/setup-python@v6