Change Details

- Update `mail/dovecot` to `2.3.16` (https://dovecot.org/pipermail/dovecot-news/2021-August/000463.html) - Update `maill/dovecot-pigeonhole` to `0.5.16` (https://dovecot.org/pipermail/dovecot-news/2021-August/000464.html) - portlint, portclippy, portfmt passed - testport passed on `stable/13` Also dogfooded.

``` Update Dovecot & Pigeonhole - Update mail/dovecot to 2.3.16 Changelog: https://dovecot.org/pipermail/dovecot-news/2021-August/000463.html) - Update mail/dovecot-pigeonhole to 0.5.16 Changelog: https://dovecot.org/pipermail/dovecot-news/2021-August/000464.html) Reviewed_by: ??? Differential_Revision: D31434 MFH: <branch|No> (<reason>) ```

- Update `mail/dovecot` to `2.3.16` (https://dovecot.org/pipermail/dovecot-news/2021-August/000463.html)``` - Update `maill/dDovecot-pigeonhole` to `0.5.16` (https://dovecot.org/pipermail/dovecot-news/2021-August/000464.html)ot & Pigeonhole - portlint, portclippy, portfmt passedUpdate mail/dovecot to 2.3.16 Changelog: https://dovecot.org/pipermail/dovecot-news/2021-August/000463.html) - Update mail/dovecot-pigeonhole to 0.5.16 Changelog: https://dovecot.org/pipermail/dovecot-news/2021-August/000464.html) Reviewed_by: ??? - testport passed on `stable/13`Differential_Revision: D31434 MFH: <branch|No> (<reason>) Also dogfooded.```