Update plugin for Nextcloud 26 and 27

[Luncheon3462]

Hi. Appreciate the developer's efforts. The nextcloud mail app is quite slow and haven't had much luck with snappymail. With nextcloud moving to 27, I wanted to ask about plans for updating this app to be compatible with NC26 and NC27. I don't code, but can make a donation/set a bounty to help with the dev's efforts. Just need to know where/how.