Removes pull_request from update report GitHub Action

This caused a new Pull Request to update the report on every Pull
Request. I updated it to only do this when pushing to main.

Author: picandocodigo

.github/workflows/report.yml

@@ -4,9 +4,6 @@ on:
   push:
     branches:
       - main
-  pull_request:
-    branches:
-      - main
 jobs:
   generate_report:
     runs-on: ubuntu-latest