Resolves #1801

This PR upgrades all Python packages to their latest versions, most notably Flask from 2.3.2 to 3.1.1.

Notes

1. The upgrade was surprisingly painless, apart from the admin of updating links to package licenses.
   • Many python packages moved their license to a licenses/ subdirectory.
   • For packages that don't contain a license file, we link to their online git repo. It seems GitHub has updated their domain for links to raw files (i.e., github.com -> raw.githubusercontent.com).
   • I've used this opportunity to update some previously outdated license links (e.g., uStreamer, Janus)
2. These changes were initially made in the Pro repo and tested on a device, then backported to the Community repo. I'd recommend doing any manual on-device testing using the following Pro scratch PR to exercise some additional pro-specific dependencies:
   • https://github.com/tiny-pilot/tinypilot-pro/pull/1534