ci: remove the commit check against pull_request_target

Signed-off-by: Xiaoxue Wang <xiaoxwan@redhat.com>

rh-pre-commit.version: 2.3.1
rh-pre-commit.check-secrets: ENABLED

.github/workflows/commit_checker.yaml

@@ -6,12 +6,6 @@ on:
       - edited
       - reopened
       - synchronize
-  pull_request_target:
-    types:
-      - opened
-      - edited
-      - reopened
-      - synchronize
   push:
     branches:
       - main