revert pull_request_target change (#321)

There are some git ref implications in CI to changing to pull_request_target that we need to consider before fully moving to this model so we should revert this change for now

.github/workflows/ci.yml

@@ -4,7 +4,7 @@ on:
   push:
     branches:
       - main
-  pull_request_target:
+  pull_request:
     branches:
       - "*"