Run prefer-lowest on 7.2

Author: markstory

.github/workflows/ci.yml

@@ -18,7 +18,7 @@ jobs:
         db-type: [mysql, pgsql, sqlite]
         prefer-lowest: ['']
         include:
-          - php-version: '7.4'
+          - php-version: '7.2'
             db-type: 'sqlite'
             prefer-lowest: 'prefer-lowest'