Add a patch from upstream that fixes a crash with the trash plugin:

Panic: file mail-namespace.c: line 709 (mail_namespace_find): assertion failed: (ns != NULL)

Bump PORTREVISION.

PR: 217364
Submitted by: Max Kostikov
Obtained from: https://github.com/dovecot/core/commit/326fb016a23480e4ff8dcc03dc80e76812859bd6.patch