sysutils/py-tldr: update to 3.4.1

While here:

• switch upstream from GitHub to PyPI per python ports policy
• add USES=shebangfix

Changelog: https://github.com/tldr-pages/tldr-python-client/blob/main/CHANGELOG.md

PR: 286463
Reported by: King John <jinking.this@gmail.com> (maintainer)
Reviewed by: wen <wenheping2000@hotmail.com>