Increment the homekit config version when restarting (#47209)

If an entity changes between restart the iOS/controller
device may have cached the old chars for the accessory.
To force the iOS/controller to reload the chars, we
increment the config version when Home Assistant restarts

tests/components/homekit/test_homekit.py

@@ -540,6 +540,7 @@ async def test_homekit_start(hass, hk_driver, device_reg):
     assert (device_registry.CONNECTION_NETWORK_MAC, formatted_mac) in device.connections
 
     assert len(device_reg.devices) == 1
+    assert homekit.driver.state.config_version == 2
 
 
 async def test_homekit_start_with_a_broken_accessory(hass, hk_driver, mock_zeroconf):