Fix CI matrix runs-on evaluation

Author: lam0819

.github/workflows/run-tests.yml

@@ -11,12 +11,11 @@ on:
 
 jobs:
   test:
-    runs-on: ${{ matrix.os }}
+    runs-on: ubuntu-latest
     timeout-minutes: 5
     strategy:
       fail-fast: true
       matrix:
-        os: [ubuntu-latest]
         php: [8.4, 8.3]
         laravel: [12.*, 11.*]
         stability: [prefer-stable]
@@ -31,7 +30,7 @@ jobs:
           - laravel: 11.*
             testbench: 9.*
 
-    name: P${{ matrix.php }} - L${{ matrix.laravel }} - ${{ matrix.stability }} - ${{ matrix.os }}
+    name: P${{ matrix.php }} - L${{ matrix.laravel }} - ${{ matrix.stability }}
 
     steps:
       - name: Checkout code