upgrade dovecot packages from v2.3.19.1-r0 to v2.3.19.1-r6 (see below, includes patch for CVE-2022-30550)
https://git.alpinelinux.org/aports/commit/main/dovecot?h=3.17-stable&id=d6d87e9d44813f5081bc51f99cc5d2a63985260a
https://git.alpinelinux.org/aports/commit/main/dovecot?h=3.17-stable&id=34a52a58420c709122a9fe15f48acad6bfa664be
https://git.alpinelinux.org/aports/commit/main/dovecot?h=3.17-stable&id=6ecdbbcec3c1d1ae03b5eafccb5227f078263a1a
https://git.alpinelinux.org/aports/commit/main/dovecot?h=3.17-stable&id=7576654e3bc8b727b3e8c784c698e14780388226
https://git.alpinelinux.org/aports/commit/main/dovecot?h=3.17-stable&id=39cde24fb54a667a6730bdaec3233184227131f6
https://git.alpinelinux.org/aports/commit/main/dovecot?h=3.17-stable&id=6b2ffcae45505bddbc92356e829091c9508c506a
https://git.alpinelinux.org/aports/commit/main/dovecot?h=3.17-stable&id=13c7f6500189062c3e0b56487b19df2a7fd4812d
https://git.alpinelinux.org/aports/commit/main/dovecot?h=3.17-stable&id=0176fd8a4a864da718ddcd6620e8f078b19fbfdc
https://git.alpinelinux.org/aports/commit/main/dovecot?h=3.17-stable&id=f3a25639854498205167433c9151d7a28a41af08