fix: use --force for snipsync bot branch push (#4422)

The --force-with-lease check fails because the workflow only checks out
main and never fetches the existing snipsync/daily-update remote ref,
causing a "stale info" rejection. Since this is a bot-managed branch
recreated from main each run, --force is safe and appropriate.

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: lennessyy

.github/workflows/snipsync.yml

@@ -57,7 +57,7 @@ jobs:
           git checkout -B "$branch_name"
           git add docs/
           git commit -m "chore: sync code snippets via snipsync"
-          git push --force-with-lease origin "$branch_name"
+          git push --force origin "$branch_name"
 
       - name: Create or update PR
         if: steps.changes.outputs.has_changes == 'true'