Update ci.yml

Author: mpyw

.github/workflows/ci.yml

@@ -35,7 +35,6 @@ jobs:
           - { php: 8.1, lib: { laravel: ^7.0 } }
           - { php: 8.1, lib: { laravel: ^6.0 } }
           - { php: 8.1, lib: { laravel: ^6.0, flags: --prefer-lowest } }
-          - { php: '8.0', lib: { laravel: ^6.0, flags: --prefer-lowest } }
           - { php: 7.4, lib: { laravel: ^9.0 } }
           - { php: 7.3, lib: { laravel: ^9.0 } }