Fix formatting in build.yml for Laravel versions

Author: jasonmccreary

.github/workflows/build.yml

@@ -20,7 +20,7 @@ jobs:
       fail-fast: false
       matrix:
         php-version: ['8.2', '8.3', '8.4']
-        laravel-version: [12, '13']
+        laravel-version: ['12', '13']
         os: [ubuntu-latest, windows-latest, macos-latest]
         stability: [prefer-lowest, prefer-stable]
         experimental: [false]