Modernize Talon to Python 3.8+, update dependencies, migrate to pytes…#247

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berkozero:python3-modernize

Commits on May 30, 2025

Modernize Talon to Python 3.8+, update dependencies, migrate to pytest, retrain ML model. Most tests pass, 8 HTML xfails deferred. See todo.md for details.
berkozero
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Modernize ML tests: fix model loading, mocks, and related test issues
berkozero
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