Change CLA event

.github/workflows/cla.yml

@@ -2,8 +2,6 @@ name: 'CLA Assistant'
 on:
   issue_comment:
     types: [created]
-  pull_request:
-    types: [opened, closed, synchronize]
   pull_request_target:
     types: [opened, closed, synchronize]
 
@@ -12,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: 'CLA Assistant'
-        if: (github.event.comment.body == 'recheckcla' || github.event.comment.body == 'I have read the CLA Document and I hereby sign the CLA') || github.event_name == 'pull_request'
+        if: (github.event.comment.body == 'recheckcla' || github.event.comment.body == 'I have read the CLA Document and I hereby sign the CLA') || github.event_name == 'pull_request_target'
         # Alpha Release
         uses: gnosis/github-action@master
         # GitHub token, automatically provided to the action