core: Enphase Envoy integration KeyError

The problem

I’m getting a KeyError a few times per day with the Enphase Envoy integration. Seven errors over the last two days. Per the traceback below, it is not finding my serial number.

The Production Right Now and Production Lifetime sensors appear to be working properly, but the Production Today and Production Last Seven Days values are two days old - roughly the time of the first error.

What version of Home Assistant Core has the issue?

2023.11.2

What was the last working version of Home Assistant Core?

unknown, just installed

What type of installation are you running?

Home Assistant OS

Integration causing the issue

enphase_envoy

Link to integration documentation on our website

https://www.home-assistant.io/integrations/enphase_envoy/

Diagnostics information

config_entry-enphase_envoy-59493540ff4b0613c1e0ae0424d2df37.json.txt

Example YAML snippet

n/a

Anything in the logs that might be useful for us?

Logger: homeassistant
Source: components/enphase_envoy/sensor.py:486
First occurred: November 10, 2023 at 10:18:16 PM (7 occurrences)
Last logged: 4:40:10 AM

Error doing job: Task exception was never retrieved
Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/helpers/update_coordinator.py", line 233, in _handle_refresh_interval
    await self._async_refresh(log_failures=True, scheduled=True)
  File "/usr/src/homeassistant/homeassistant/helpers/update_coordinator.py", line 389, in _async_refresh
    self.async_update_listeners()
  File "/usr/src/homeassistant/homeassistant/helpers/update_coordinator.py", line 172, in async_update_listeners
    update_callback()
  File "/usr/src/homeassistant/homeassistant/helpers/update_coordinator.py", line 469, in _handle_coordinator_update
    self.async_write_ha_state()
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 743, in async_write_ha_state
    self._async_write_ha_state()
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 843, in _async_write_ha_state
    state, attr = self._async_generate_attributes()
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 784, in _async_generate_attributes
    state = self._stringify_state(available)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 749, in _stringify_state
    if (state := self.state) is None:
                 ^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/components/sensor/__init__.py", line 501, in state
    value = self.native_value
            ^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/components/enphase_envoy/sensor.py", line 486, in native_value
    return self.entity_description.value_fn(inverters[self._serial_number])
                                            ~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^
KeyError: '<<<my serial number>>>'

### Additional information

_No response_