CLN/MAINT: Fix learncurve order and CI#719

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NickleDave wants to merge 3 commits intomainfrom

fix-learncurve-order-and-ci

Commits on Oct 17, 2023

Fix how train_dur is sorted in learncurve.frame_classification
NickleDave
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From __future__ import annotations in prep/frame_classification/source_files.py and add module-level docstring
NickleDave
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Fix ci-linux.yml to *not* run tests with nox
NickleDave
committed