www/py-lektor: update 3.3.7 to 3.3.10
WHILE HERE * added markupsafe and pytz dependencies; * changed "patch-mistune" by not patching many files with one single diff; * reflecting $PORTVERSION on setup.py properly on 'post-patch'. CHANGELOG * https://github.com/lektor/lektor/blob/v3.3.10/CHANGES.md
Sponsored by: The Tor Project
Sponsored by: TorBSD Diversity Project (TDP)