fix pull_request

Author: Manigurr

.github/workflows/pre_merge.yml

@@ -6,7 +6,7 @@ on:
   push:
     branches:
       - meta-qcom_full-build
-  pull_request_target:
+  pull_request:
     types: [opened, synchronize, reopened]
     branches:
       - meta-qcom_full-build