mail/snappymail: Update to 2.33.0

ChangeLog: https://github.com/the-djmaze/snappymail/releases/tag/v2.33.0
ChangeLog: https://github.com/the-djmaze/snappymail/releases/tag/v2.32.0
ChangeLog: https://github.com/the-djmaze/snappymail/releases/tag/v2.31.0
ChangeLog: https://github.com/the-djmaze/snappymail/releases/tag/v2.30.0
ChangeLog: https://github.com/the-djmaze/snappymail/releases/tag/v2.29.4
ChangeLog: https://github.com/the-djmaze/snappymail/releases/tag/v2.29.3
MFH: 2024Q1