Use action/checkout@v4

Author: shivarm

.github/workflows/deploy-blog-posts.yml

@@ -22,7 +22,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Publish articles on dev.to
       uses: sinedied/publish-devto@v2
       id: publish_devto
@@ -54,4 +54,4 @@ jobs:
           Changes result:
           ```
           ${{ steps.publish_devto.outputs.result_summary }}
-          ```
+          ```