upgrade dovecot packages from v2.3.19.1-r6 to v2.3.20-r6 (see below)
https://web.archive.org/web/20221223205049/https://dovecot.org/pipermail/dovecot-news/2022-December/000479.html
https://web.archive.org/web/20221223205057/https://git.alpinelinux.org/aports/commit/main/dovecot?h=3.17-stable&id=2af82ee738d741c76549c1fa6b14e98722dd1adf