Switch trigger to pull_request

It seems the action isn't triggered when using
pull_request_target, don't know why.

Signed-off-by: Chihurumnaya Ibiam <ibiamchihurumnaya@gmail.com>

Author: chimosky

.github/workflows/pr-jest-tests.yml

@@ -1,7 +1,7 @@
 name: Run Jest Tests on PR
 
 on:
-  pull_request_target:
+  pull_request:
     types:
       - opened
       - synchronize