Version 0.12.3

This is a quick release to handle changes in rich-click 1.9 that break --help on Windows if not using unicode by default on your terminal.

Fixes:

• Support rich-click 1.9+ on Windows by @henryiii in #286

WebApp:

• Bump webapp to 0.12.2 by @henryiii in #276
• Bump to Pyodide 0.28 by @agriyakhetarpal in #282

Full Changelog: v0.12.2...v0.12.3