Update run-tests.yml

Author: pascalbaljet

.github/workflows/run-tests.yml

@@ -10,7 +10,7 @@ jobs:
       matrix:
         php: [ 7.1, 7.2, 7.3, 7.4, 8.0 ]
         laravel: [ 5.6.*, 5.7.*, 5.8.*, 6.*, 7.*, 8.* ]
-        dependency-version: [ prefer-lowest, prefer-stable ]
+        dependency-version: [ prefer-stable ]
         include:
           - laravel: 5.6.*
             testbench: 3.6.*