fix(helpers): use asyncio.get_running_loop() inside async methods

[Ghraven]

What

Three async methods in src/openai/helpers/ call asyncio.get_event_loop() from inside a running coroutine:

• LocalAudioPlayer.play (local_audio_player.py)
• LocalAudioPlayer.play_stream (local_audio_player.py)
• Microphone.record (microphone.py)

Why it matters

Since Python 3.10, calling asyncio.get_event_loop() when there is no current event loop is deprecated, and calling it from within a coroutine to obtain the running loop emits a DeprecationWarning. The documented replacement for code that runs inside a coroutine is asyncio.get_running_loop().

Fix

# Before
loop = asyncio.get_event_loop()
# After
loop = asyncio.get_running_loop()

In all three cases the loop is obtained inside an async def and only used for run_in_executor / call_soon_threadsafe, so there is always a running loop and behavior is unchanged. This just removes the deprecation and makes the intent explicit.

Scope

Three one-line changes in src/openai/helpers/ (a hand-maintained, non-generated path). Files still parse and import. Happy to adjust if you would prefer a different approach.