fixes #1980 launch pre commit only if a python file is modified [3]

Author: vsct-jburet

.github/workflows/validate-build.yml

@@ -188,6 +188,7 @@ jobs:
   precommit:
     name: Pre-commit
     runs-on: ubuntu-latest
+    needs: changes
     timeout-minutes: 15
     if: ${{ needs.changes.outputs.python == 'true'  || needs.changes.outputs.gha == 'true'}}