update actions/checkout to v4 (#602)

Author: getong

.github/workflows/proxy-docker-dev.yml

@@ -7,7 +7,7 @@ jobs:
   build-push-docker:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 100
           token: ${{ secrets.REPO_TOKEN }}

.github/workflows/proxy-docker-prod.yml

@@ -7,7 +7,7 @@ jobs:
   build-push-docker:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 100
           token: ${{ secrets.REPO_TOKEN }}