misc/py-posthog: Update 4.0.1 => 7.14.1, take maintainership

Changelog:
https://github.com/PostHog/posthog-python/blob/7.14.1/CHANGELOG.md

Improve port:

• Remove unnecessary DISTNAME because it's default value.
• Make a slight update to the Comment.
• Add additional WWW.
• Remove shebangfix because this port doesn't seem to install any executable scripts.
• Update post-install-DOCS-on because it deals with no man pages.

PR: 295253
Sponsored by: UNIS Labs