mail/aerc: update 0.18.1 → 0.18.2

Fixed:

• Builtin calendar filter error with non-GNU Awk.
• Detection of unicode width measurements on tmux 3.4.
• Dropping of events during large pastes.
• Home and End key decoding for the st terminal.

Changelog:
https://git.sr.ht/~rjarry/aerc/refs/0.18.2

PR: 280606