fix(ci): use pr url to obtain contributors PR number

gh pr create does not support --json/--jq flags, which caused the
contributors workflow to fail with 'unknown flag: --json'. Capture
the PR URL printed by gh pr create and parse the number from it.

Signed-off-by: Xiangyu Wang <wxyucs@gmail.com>
Signed-off-by: OpenCode (claude-opus-4.7) <noreply@opencode.ai>
Signed-off-by: Xiangyu Wang <wxy407827@antgroup.com>

Author: wxyucs

.github/workflows/contributors.yml

@@ -58,7 +58,8 @@ jobs:
           pr_number="$(gh pr list --base main --head "$branch" --state open --json number --jq '.[0].number // empty')"
 
           if [ -z "$pr_number" ]; then
-            pr_number="$(gh pr create --base main --head "$branch" --title "$title" --body "" --json number --jq '.number')"
+            pr_url="$(gh pr create --base main --head "$branch" --title "$title" --body "")"
+            pr_number="${pr_url##*/}"
           else
             gh pr edit "$pr_number" --title "$title" --body ""
           fi