Update pysplashsurf_CI.yml

Author: w1th0utnam3

.github/workflows/pysplashsurf_CI.yml

@@ -1,13 +1,10 @@
-# This file is autogenerated by maturin v1.8.2
-# To update, run
-#
-#    maturin generate-ci github
-#
 name: Python bindings
 
 on:
   push:
     branches: [main]
+  pull_request:
+    branches: [main]
   workflow_dispatch:
   release:
     types: [published]