fix: fix DeprecationWarning for asyncio.iscoroutinefunction

[jules-ch]

Description of change

Small PR to handle deprecation in Python3.14

asyncio.iscoroutinefunction is deprecated in favor of inspect.iscoroutinefunction

Pull Request check-list

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• Do tests and lints pass with this change?
• Do the CI tests pass with this change (enable it first in your forked repo and wait for the github action build to finish)?
• Is the new or changed code fully tested?
• Is a documentation update included (if this change modifies existing APIs, or introduces new ones)?
• Is there an example added to the examples folder (if applicable)?

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Note

Low Risk
Low risk compatibility change that only affects coroutine detection paths; behavior should remain equivalent but could differ for edge-case callables on newer Python versions.

Overview
Updates async coroutine detection to avoid Python 3.14 deprecation warnings by switching from asyncio.iscoroutinefunction to inspect.iscoroutinefunction.

This affects both connection setup when calling a custom redis_connect_func (redis/asyncio/connection.py) and async multidb pubsub method execution (redis/asyncio/multidb/command_executor.py).

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