ci: only run tests on latest/stable versions

Author: JaZo

.github/workflows/tests.yml

@@ -11,7 +11,7 @@ jobs:
       matrix:
         php: [ '7.4', '8.0', '8.1', '8.2' ]
         laravel: [ '8.*', '9.*', '10.*' ]
-        stability: [ prefer-lowest, prefer-stable ]
+        stability: [ prefer-stable ]
         exclude:
           - laravel: '8.*'
             php: '8.2'