Update add_to_project_board.yml

remove pr from the add-to-project-board workflow

Author: ArielA147

.github/workflows/add_to_project_board.yml

@@ -1,9 +1,9 @@
 name: Add new pr or issue to project board 
 
-on: [issues, pull_request]    
+on: [issues]    
 
 jobs:
   add-to-project:
     uses: lambdaisland/open-source/.github/workflows/add-to-project-board.yml@main
     secrets: inherit
-    
+