fix: use corrent indentation in tests config

Author: simonerd

.github/workflows/tests.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-      os: [ubuntu-latest]
+        os: [ubuntu-latest]
         php: [8.3, 8.2]
         laravel: [11.*, 10.*]
         statamic: [5.*, 4.*]