Fix opening PR in regenerate-windows-sys.yml (#1353)

Author: NobodyXu

.github/workflows/regenerate-windows-sys.yml

@@ -54,4 +54,4 @@ jobs:
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
-          gh pr create --base main --title "Regenerate windows sys bindings" --body "Automatically regenerated in CI"
+          gh pr create --base main --title "Regenerate windows sys bindings" --body "Automatically regenerated in CI" --head $(git branch --show-current)