Bump actions/checkout from 3 to 4 (#953)

Author: dependabot[bot]

.github/workflows/pkg.yml

@@ -12,7 +12,7 @@ jobs:
       image: debian:12
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Install dependencies
       run: |