fix: correct YAML syntax error in enhanced-ci workflow preflight job

Author: d-oit

.github/workflows/enhanced-ci.yml

@@ -51,7 +51,7 @@ jobs:
       docs: ${{ steps.changes.outputs.docs }}
       scripts: ${{ steps.changes.outputs.scripts }}
       has_changes: ${{ steps.changes.outputs.has_changes }}
-  steps:
+    steps:
     - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955
       with:
         fetch-depth: 0