Log Message:
mail/dovecot2-pigeonhole: update to 0.5.8

Update dovecot2-pigeonhole to 0.5.8.

0.5.8 2019-10-08

Changes

- Sieve may leak resources in rare cases when a redirect, vacation or
  report action fails to send the message. This mainly applies when Sieve
  is executed in IMAP context; i.e., for the IMAPSIEVE or FILTER=SIEVE
  capabilities.