fix dynamic property deprecation notice in testsuite on php 8.3

[lubiana]

ApplicationTest::test_array_action() uses the dynamic property $actionCalled, which is not registered in the testclass. on 8.3 this throws a depecration notice, this small pr fixes that.

[lubiana]

So I tried to figure out, why the pipeline fails, althoug the tests run locally without problem. It seems that the Terminal::width() method returns 0 in the github action runner, which causes the justify method to not return any dashes and therefore the tests fail.

I was able to make that testcase work again: c90400b but i am not sure if that is the correct direction as i had to use reflection, to change ther Writers terminal property into a mocked terminal. I think the better solution would be to make the terminal property injectable via constructor, so we can provide a mocked instance in the test. On the other hand the failing test should not be concerned about the terminal class working properly so my solution for the test might be ok, and the other issues could be dealt with in the future.

[adhocore]

thank you 👍