feature: replace `asyncio.iscoroutinefunction` with `inspect.iscoroutinefunction`

[Creeper19472]

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Describe the requested feature

I hereby request asyncio.iscoroutinefunction to be replaced with inspect.iscoroutinefunction since the former one is marked as deprecated in Python 3.14 and will be removed in Python 3.16.

.venv\Lib\site-packages\flet\messaging\flet_socket_server.py:253: DeprecationWarning: 'asyncio.iscoroutinefunction' is deprecated and slated for removal in Python 3.16; use inspect.iscoroutinefunction() instead

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[ndonkoHenri]

Will you like to make a PR? 😉

[Creeper19472]

I'll do it when I'm free