Get the CI Working

[gordonwatts]

Ouch - left it broken for a very long time! This PR is just about getting that working again.

• Fix up flake8 errors
• Clean up CI build - do not force-install qastle anymore (that was from a long time ago).
• Move to using python 3.10 as our default check to make sure everything works.

[codecov[bot]]

Codecov Report

Merging #207 (55007ef) into master (ebee8e6) will decrease coverage by 0.28%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #207      +/-   ##
==========================================
- Coverage   95.43%   95.15%   -0.28%     
==========================================
  Files          31       35       +4     
  Lines        1861     1880      +19     
  Branches      249      249              
==========================================
+ Hits         1776     1789      +13     
- Misses         53       59       +6     
  Partials       32       32              

Flag	Coverage Δ
unittests	95.15% <100.00%> (-0.28%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
func_adl_xAOD/common/local_dataset.py	100.00% <100.00%> (ø)
func_adl_xAOD/cms/miniaod/__init__.py	66.66% <0.00%> (ø)
func_adl_xAOD/__init__.py	100.00% <0.00%> (ø)
func_adl_xAOD/atlas/xaod/__init__.py	60.00% <0.00%> (ø)
func_adl_xAOD/cms/aod/__init__.py	66.66% <0.00%> (ø)

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