fix mem tests

Author: cmgmyr

.github/workflows/run-tests.yml

@@ -104,5 +104,5 @@ jobs:
       - name: Execute tests (Unit and Feature tests) via PHPUnit
         env:
           DB_CONNECTION: sqlite
-          DB_DATABASE: :memory:
+          DB_DATABASE: ':memory:'
         run: vendor/bin/phpunit --testdox