misc/py-llm: Update 0.27 => 0.31, take maintainerhsip

Changelog:
https://github.com/simonw/llm/releases/tag/0.27.1
https://github.com/simonw/llm/releases/tag/0.28
https://github.com/simonw/llm/releases/tag/0.29
https://github.com/simonw/llm/releases/tag/0.30
https://github.com/simonw/llm/releases/tag/0.31

PR: 295216
Sponsored by: UNIS Labs