chore(workflow): simplify file specification in markdown update workflow

Author: chemodun

.github/workflows/on-markdown-update.yml

@@ -26,8 +26,7 @@ jobs:
         uses: chemodun/[email protected]
         with:
           # Avoid using single or double quotes for multiline patterns
-          files: |
-            README.md
+          files: README.md
 
       - name: Install python3
         if: steps.changed-markdown-files.outputs.any_changed == 'true'