Update prerelease.yml

Author: rli

.github/workflows/prerelease.yml

@@ -8,8 +8,6 @@ on:
         default: prerelease
   push:
     branches: [ main, feature/* ]
-  pull_request:
-    branches: [ '**' ]
 
 concurrency:
   group: ${{ github.workflow }}${{ github.event.pull_request.number || github.ref }}