bermuda uses device_registry.devices which is deprecated

## Describe the bug
Testing the September 2026 core beta release the following depreciation warning is generated:

Logger: homeassistant.helpers.frame
Source: helpers/frame.py:348
First occurred: 08:17:47 (3 occurrences)
Last logged: 08:17:58

Detected that custom integration 'bermuda' uses `device_registry.devices` as a mapping or calls its lookup methods, which is deprecated; iterate it to get the device entries, or use `async_get`, `async_entries_for_config_entry` and similar helpers for lookups at custom_components/bermuda/bermuda_device.py, line 321: devreg_devices = self._coordinator.dr.devices.get_entries(None, connections=connlist). This will stop working in Home Assistant 2027.9.0, please create a bug report at https://github.com/agittins/bermuda/issues

No actual impact on operation, at least not for another year :)

Start in custom_components/bermuda/bermuda_device.py around line 321, where the deprecated device registry lookup is reported. Read the warning and the surrounding coordinator code, then verify the lookup no longer triggers the deprecation warning under the September 2026 Home Assistant core beta.

Escrita pelo modelo de indexação a partir do texto da issue.