fix: update actions/checkout version to v6 in workflow files

Author: liuruibin

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

@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           ref: ${{ github.ref_name }}
       - name: Prepare

.github/workflows/build-and-push-vector-model.yml

@@ -22,7 +22,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           ref: ${{ github.ref_name }}
       - name: Prepare

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

@@ -43,7 +43,7 @@ jobs:
           ls -la
           rm -rf -- ./* ./.??*
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           ref: ${{ github.ref_name }}
       - name: Prepare
@@ -99,7 +99,7 @@ jobs:
           ls -la
           rm -rf -- ./* ./.??*
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           ref: ${{ github.ref_name }}
       - name: Prepare