Revert previous auto-modernise commits

[jeremyh]

Some changes by shed have broken the semantics of sqlalchemy queries (see #581)

• Revert the original, offending commit that breaks result iteration.
• Also update our usage of == None, which has a better equivalent in modern sqlalchemy (and was also broken by it)
• Move from shed to ruff. Most of our newer repositories used ruff anyway, so it seems a good reason to switch.

I haven't retested the original issues, this is a just reverting some clear errors.

Note that ruff has made some changes of its own to match its black-like formatting, but they're minor

---

📚 Documentation preview 📚: https://datacube-explorer--587.org.readthedocs.build/en/587/

[codecov]

Codecov Report

Attention: Patch coverage is 88.00000% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 86.32%. Comparing base (aa0d9f3) to head (ed70628).
Report is 23 commits behind head on develop.

Files	Patch %	Lines
cubedash/warmup.py	0.00%	2 Missing ⚠️
cubedash/_stac.py	90.00%	1 Missing ⚠️
cubedash/generate.py	66.66%	1 Missing ⚠️
cubedash/summary/_extents.py	66.66%	1 Missing ⚠️
cubedash/summary/_schema.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #587      +/-   ##
===========================================
+ Coverage    86.29%   86.32%   +0.03%     
===========================================
  Files           26       26              
  Lines         3451     3466      +15     
===========================================
+ Hits          2978     2992      +14     
- Misses         473      474       +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[omad]

Thanks!