fix: update checkout reference to v1 in build-and-push workflow

Author: liuruibin

.github/workflows/build-and-push-python-pg.yml

@@ -33,7 +33,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
         with:
-          ref: main
+          ref: v1
       - name: Prepare
         id: prepare
         run: |