Merge pull request #63 from mdrocan/upgrade_checkout_action

upgrade to v4

Author: mdrocan

.github/workflows/main.yml

@@ -17,7 +17,7 @@ jobs:
       pull-requests: write
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0