fix for wait_container_is_ready decorator being depreciated

[sylphia-nox]

Fixes the below depreciation warning for @wait_container_is_ready decorator.

...venv\Lib\site-packages\testcontainers\core\waiting_utils.py:215
\python-wiremock.venv\Lib\site-packages\testcontainers\core\waiting_utils.py:215: DeprecationWarning: The @wait_container_is_ready decorator is deprecated and will be removed in a future version. Use structured wait strategies instead: container.waiting_for(HttpWaitStrategy(8080).for_status_code(200)) or container.waiting_for(LogMessageWaitStrategy('ready'))
@wait_container_is_ready()

Please let me know if more information is needed. There does not seem to be a lot of documentation available online right now for this issue.

I did confirm that this PR reduces the warnings when running tests from 7 to 6.

#126

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