only tests stable

Author: cesargb

.github/workflows/tests.yml

@@ -14,7 +14,7 @@ jobs:
             matrix:
                 php: [7.3, 7.4, 8.0]
                 laravel: [8.*, 7.*, 6.*]
-                dependency-version: [prefer-lowest, prefer-stable]
+                dependency-version: [prefer-stable]
                 include:
                     - laravel: 8.*
                       testbench: 6.*