Experimentally, I found out that the version of the ESPHome dashboard can only be updated by deleting and reinstalling the adapter...
iobroker del esphhome
iobroker add esphome
neither "download files" nor "restore" from the expert capabilities of the adapter work.
Now, if you remove it and install it again, then the latest version is pulled up (at the moment v2022.1.1)
but some objects have parameters set and they don't want to be lost along with the removal of the driver. How can I update the dashboard version without deleting the objects and their properties?