Fix github action syntax

Author: bilfeldt

.github/workflows/run-tests.yml

@@ -1,22 +1,24 @@
 name: run-tests
 
-on: [push, pull_request]
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
 
 jobs:
   test:
     runs-on: ${{ matrix.os }}
+
     strategy:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest]
         php: [8.3, 8.2, 8.1]
         laravel: [10.*, 9.*]
         stability: [prefer-stable]
-        include:
-          - laravel: 10.*
-            testbench: 8.*
-          - laravel: 9.*
-            testbench: 7.*
         include:
           - laravel: 9.*
             testbench: 7.*