Remove v5 branch from github action pr trigger

Author: StevenWeathers

.github/workflows/ci.yml

@@ -7,7 +7,7 @@ on:
       - '*'
     branches: [ main ]
   pull_request:
-    branches: [ main, v5 ]
+    branches: [ main ]
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}