Log Message:
Update to 4.44.0. From the changelog:

- add extended SSL options for IMAP retrievers, allowing certificate
  verification and other features. Thanks: Steven Murdoch.
- fix missing plaintext versions of documentation. Thanks: Osamu Aoki.
- fix "Header instance has no attribute 'strip'" error which cropped
  up in some configurations. Thanks: Krzysztof Warzecha.

Updating this leaf package during the freeze for security improvements
and bugfixes.