Upgrade morango to resolve dirty-bit issue and cleanup

[bjester]

Summary

• Upgrades Morango which includes a fix to correct behavior handling the dirty bit when models are saved with update_fields
• Adds regression tests for the existing logging functionality that was avoiding this issue

Verifications

Tests added to verify existing fix

Existing fix is removed exposing failed tests

Morango is upgraded showing it covers existing fix

References

learningequality/morango#326

Reviewer guidance

See verifications list above, which shows:

1. The existing logging API handled this issue manually
2. Without that manual fix, those cases are problematic
3. Morango solves the issue and removes the need for the manual fix

This methodology was for the benefit of the reviewer. After review, I think we could drop the first commit, which adds the tests, with confidence in Morango, but feel free to specify otherwise.

AI usage

Asked AI to write the tests, but I had to update how they were setting the dirty bit to False before the actual scenario.

[github-actions]

Build Artifacts

Asset type	Download link
PEX file	kolibri-0.19.4a0.dev0_git.6.g0c07c4b3.pex
Windows Installer (EXE)	kolibri-0.19.4a0.dev0+git.6.g0c07c4b3-windows-setup-unsigned.exe
Debian Package	kolibri_0.19.4a0.dev0+git.6.g0c07c4b3-0ubuntu1_all.deb
Mac Installer (DMG)	kolibri-0.19.4a0.dev0+git.6.g0c07c4b3.dmg
Android Package (APK)	kolibri-0.19.4a0.dev0+git.6.g0c07c4b3-0.1.10-debug.apk
Raspberry Pi Image	kolibri-pi-image-0.19.4a0.dev0+git.6.g0c07c4b3.zip
TAR file	kolibri-0.19.4a0.dev0+git.6.g0c07c4b3.tar.gz
WHL file	kolibri-0.19.4a0.dev0+git.6.g0c07c4b3-py2.py3-none-any.whl

Smoke test screenshot

Download screenshot