Fix the voltage value of the relay switch

[greyeee]

Fix the voltage value of the relay switch, combine the advertisement and obtain the voltage and current through the command to update the device state.

[codecov]

Codecov Report

Attention: Patch coverage is 90.47619% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
switchbot/devices/relay_switch.py	89.47%	2 Missing ⚠️

Files with missing lines	Coverage Δ
switchbot/adv_parser.py	92.85% <ø> (ø)
switchbot/adv_parsers/relay_switch.py	77.77% <100.00%> (+44.44%)	⬆️
switchbot/const.py	100.00% <100.00%> (ø)
switchbot/devices/relay_switch.py	59.66% <89.47%> (+32.21%)	⬆️

... and 1 file with indirect coverage changes

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[bdraco]

We should use create_task here instead

Additionally the event loop doesn't hold strong references to tasks so we need to hold one ourselves to ensure it's not garbage collected before it finishes

We also need to handle the case where a previous update is still in progress and the task isn't finished yet

[greyeee]

Thank you for your valuable advice. I have addressed the issues you pointed out. I have committed the changes and pushed them to the repository. Could you please review the updated code at your earliest convenience?

[greyeee]

The Home Assistant project relies on this project as a dependency, and we have made some necessary updates. Could you please merge the changes and release a new version at your earliest convenience?

[bdraco]

We still have a risk of multiple updates running at once

A better solution is to force poll_needed to be True and let Home Assistant's coordinator manage the poll in https://github.com/home-assistant/core/blob/5ef5838b20d4d6f8d340a008cb7004bb4b580228/homeassistant/components/bluetooth/active_update_coordinator.py#L168

diff --git a/switchbot/devices/relay_switch.py b/switchbot/devices/relay_switch.py
index 3c7272b..681f270 100644
--- a/switchbot/devices/relay_switch.py
+++ b/switchbot/devices/relay_switch.py
@@ -46,6 +46,7 @@ class SwitchbotRelaySwitch(SwitchbotDevice):
         self._key_id = key_id
         self._encryption_key = bytearray.fromhex(encryption_key)
         self._model: SwitchbotModel = model
+        self._force_next_update = False
         super().__init__(device, None, interface, **kwargs)
 
     def update_from_advertisement(self, advertisement: SwitchBotAdvertisement) -> None:
@@ -68,7 +69,7 @@ class SwitchbotRelaySwitch(SwitchbotDevice):
             new_state,
         )
         if current_state != new_state:
-            asyncio.create_task(self.update())
+            self._force_next_update = True
 
     async def update(self, interface: int | None = None) -> None:
         """Update state of device."""
@@ -90,6 +91,9 @@ class SwitchbotRelaySwitch(SwitchbotDevice):
 
     def poll_needed(self, seconds_since_last_poll: float | None) -> bool:
         """Return if device needs polling."""
+        if self._force_next_update:
+            self._force_next_update = False
+            return True
         if (
             seconds_since_last_poll is not None
             and seconds_since_last_poll < PASSIVE_POLL_INTERVAL