No longer able to control Air Purifier H7122
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### What issue do you have? Please be as thorough and explicit as possible.
I am no longer able to control the fan speed of my Govee Air Purifier (H7122). This was previously working but broke with an update. I am able to see the following message in the logs:
```
[08/10/2022, 00:54:34] [Govee] [Big Air Purifier] could not be updated as no connection method available at file:///usr/local/lib/node_modules/homebridge-govee/lib/platform.js:1569:13.
```


### Details of your setup.
* Do you use (1) Homebridge UI-X (2) Homebridge CLI or (3) HOOBS? 
1 Homebridge UI


* Which version of Homebridge/HOOBS do you have?
v1.5.0


* Which platform do you run Homebridge/HOOBS on (e.g. Raspberry Pi/Windows/HOOBS Box)? Please also mention your version of Node.js/NPM if known.
Raspberry Pi


* Which version of this plugin (homebridge-govee) do you have? Has the issue started since upgrading from a previous version?
v6.0.4. Issue seems to be caused by upgrading.


* Which Govee devices do you have that are causing issues? Please include product models if applicable.
H7122


### Please paste any relevant logs below.
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```
[08/10/2022, 00:54:34] [Govee] [Big Air Purifier] could not be updated as no connection method available at file:///usr/local/lib/node_modules/homebridge-govee/lib/platform.js:1569:13.
```
