Unfortunately this is a bit limited in Home Assistant: Add the possibility to install a previous release of an addon - #6 by jmcollin
If you simply want to stay at your current version, then make sure automatic updates are off (they are by default).
Another possibility would be to make a backup of the addon, download it, extract and edit it to point to the older version, and then restore it. I have a vague recollection of doing this in the past, but clearly YMMV!
One final option would be to clone the addon locally and treat it as if you’re developing on it. Then you can change it as you see fit to update the config file to use an older tag.