K-9 Mail 21.1

Fixed:

• Could not empty the Trash folder using the Empty Trash action (#11255, #11256)

Contributors:
Thanks to: @arpitagarwal1301, @coreycb, @dani-zilla, @frabera, @himu-gupta, @mohitsatr, @mvanhorn, @rafaeltonholo, @saisafe, @shamim-emon, @stephenking314, @TusharBhatia34, @wmontwe

New Contributors:

• @mvanhorn made their first contribution in #11003
• @TusharBhatia34 made their first contribution in #11227
• @arpitagarwal1301 made their first contribution in #11280

Full Changelog: K9MAIL_21_0...K9MAIL_21_1