update pr desc check event (#33)

Update event to `pull_request_target`

Signed-off-by: Yanxuan Liu <[email protected]>

Author: YanxuanLiu

.github/workflows/pr-desc-check.yml

@@ -16,7 +16,7 @@
 name: pr description check
 
 on:
-  pull_request:
+  pull_request_target:
     types: [opened, edited, reopened]
 
 jobs: