sysutils/py-pyznap: Update to v1.1.0

Changelog:

• pyznap now uses pv to show progress of zfs send operations.
• Better error handling during zfs send over ssh.

PR: 232787
Submitted by: Dries Michiels <driesm.michiels@gmail.com> (maintainer)
Reviewed by: krion
Approved by: krion (mentor)
Differential Revision: https://reviews.freebsd.org/D17753