ci: Use micromamba to test Python and ROOT

[matthewfeickert]

• Resolves #200.
• Closes #171

Requires #218 to go in first.

• Use the mamba-org/provision-with-micromamba GitHub action to setup a micromamba enviroment with a ROOT version and CPython version defined by the CI matrix.
  • Set a default shell of a Bash login to automatically source the micromamba environment.
• Test ROOT v6.24.x and v6.26.x and all compatible Python versions with them.
  • Exclude versions of Python that are not compatible with ROOT releases.
  • Test on macOS with the latest ROOT release on conda-forge (v6.26.x) and the latest supported CPython version (3.10).
• Install ImageMagick and Ghostscript through conda-forge.
• Remove commented out macOS and Python 2.7 workflows.

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:books: Documentation preview :books:: https://hepdata-lib--220.org.readthedocs.build/en/220/

[codecov-commenter]

Codecov Report

Merging #220 (7fd168a) into master (3732906) will increase coverage by 0.20%. The diff coverage is n/a.

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@@            Coverage Diff             @@
##           master     #220      +/-   ##
==========================================
+ Coverage   87.80%   88.01%   +0.20%     
==========================================
  Files           4        4              
  Lines         968      968              
  Branches      189      202      +13     
==========================================
+ Hits          850      852       +2     
+ Misses         86       85       -1     
+ Partials       32       31       -1     

Flag	Coverage Δ
unittests-3.10	88.01% <ø> (?)
unittests-3.6	87.66% <ø> (?)
unittests-3.7	87.66% <ø> (?)
unittests-3.8	87.80% <ø> (ø)
unittests-3.9	87.80% <ø> (?)

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

Impacted Files	Coverage Δ
hepdata_lib/c_file_reader.py	92.94% <0.00%> (+0.64%)	:arrow_up:

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[matthewfeickert]

@clelange once PR #218 is merged I can rebase this and then it will be ready to go.

[matthewfeickert]

@clelange thanks for the fast review and merge of PR #218! This is now ready for review. :+1:

[matthewfeickert]

Thanks again! I'll merge this and will then make a new release so that python 2 can then be deprecated.

If you want to make a release before removing Python 2 support then let me make a PR that adds a python_requires (PR #222) before you make the release so that this release gets that. I would also recommend making a minor release after PR #221 to signify that a Python version has been dropped.