fix: Remove pull request trigger

.github/workflows/leaves.yml

@@ -1,18 +1,8 @@
-# This workflow uses actions that are not certified by GitHub.
-# They are provided by a third-party and are governed by
-# separate terms of service, privacy policy, and support
-# documentation.
-# This workflow will build a Java project with Gradle and cache/restore any dependencies to improve the workflow execution time
-# For more information see: https://help.github.com/actions/language-and-framework-guides/building-and-testing-java-with-gradle
-
 name: Leaves CI
 
 on:
   push:
     branches: [ master ]
-  pull_request:
-    types: [ closed ]
-    branches: [ master ]
   workflow_dispatch:
 
 jobs: