fix: replace deprecated set-output command

Author: cibinmathew

.github/workflows/main.yml

@@ -79,7 +79,7 @@ jobs:
           output="${output//'%'/'%25'}"
           output="${output//$'\n'/'%0A'}"
           output="${output//$'\r'/'%0D'}"
-          echo "change_summary=$output"
+          echo "change_summary=$output" >> $GITHUB_OUTPUT
         working-directory: ./scripts
 
       - name: Create PR