www/onionshare: fix DEPRECATED deps, and update pluggable transports
- fix DEPRECATED flag, by using a more reliable Python module;
- used pycryptodome instead of cryptography to keep compatibility;
- update pluggable transports support by adding snowflake.
PR: 260897, 262503, 265390
Reported by: yuri@, ruben <ruben % verweg.com>, chris <chris % crvintel.com>
Sponsored by: TorBSD Diversity Project, TDP
Sponsored by: The Tor Project