prefer latest only for testing

Author: michaeldyrynda

.github/workflows/run-tests.yml

@@ -11,7 +11,7 @@ jobs:
                 os: [ubuntu-latest]
                 php: [7.4]
                 laravel: [7.*]
-                dependency-version: [prefer-lowest, prefer-stable]
+                dependency-version: [prefer-stable]
                 include:
                     -   laravel: 7.*
                         testbench: 5.*