mail/dovecot-pigeonhole04: upgreade to 0.4.24
+ Implement plugin for the a vendor-defined IMAP capability called

"FILTER=SIEVE". It adds the ability to manually invoke Sieve filtering
in IMAP. More information can be found in
doc/plugins/imap_filter_sieve.txt.

• Fix assert panics triggered by empty messages that are being forwarded using redirect or vnd.dovecot.report. This does not likely normally occur, but this is seen as a result of certain benign failures in object storage.
• Make the length of the subject header for the vacation response configurable and enforce the limit in UTF-8 codepoints rather than bytes. The subject header for a vacation response was statically truncated to 256 bytes, which is too limited for multi-byte UTF-8 characters.
• Sieve editheader extension: Fix assertion panic occurring when it is used to manipulate a message header with a very large header field.
• Properly abort execution of the sieve_discard script upon error. Before, the LDA Sieve plugin attempted to execute the sieve_discard script when an error occurs. This can lead to the message being lost.
• Fix the interaction between quota and the sieve_discard script. When quota was used together with a sieve_discard script, the message delivery did not bounce when the quota was exceeded.