chore(ci): update github actions and docker dependencies (#368)

- Update `actions/checkout` from v3 to v4 in workflows
- Enable `allow-unsafe-pr-checkout` in `docker-build-pr.yml` to support
  PR builds with updated checkout version

.github/workflows/docker-build-pr.yml

@@ -21,9 +21,10 @@ jobs:
 
     steps:
       - name: Checkout PR code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           ref: ${{ github.event.pull_request.head.sha }}
+          allow-unsafe-pr-checkout: true
 
       - name: Set variables
         run: |

.github/workflows/gen_changelog.yml

@@ -10,7 +10,7 @@ jobs:
     permissions:
       contents: write
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           ref: main
       - uses: rhysd/changelog-from-release/action@v3