update authentication token to use GITHUB_TOKEN in GitHub Actions workflow

Author: sergeytimoshin

.github/workflows/devcontainer.yml

@@ -32,7 +32,7 @@ jobs:
         with:
           registry: ${{ env.REGISTRY }}
           username: ${{ github.actor }}
-          password: ${{ secrets.PAT_TOKEN }}
+          password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Extract metadata (devcontainer-core)
         id: core_meta