Simplify conda environments and move configs to pyproject.toml

[tomvothecoder]

Description

• Closes [DevOps]: Loosen up conda environment constraints and consolidate yml files #511
• Loosening constraints improves upgradeability of the environments with a tradeoff in determinism
• Make Python 3.9 the minimum version
• Replace Python 3.8 with Python 3.11 in build workflow
• Remove readthedocs.yml and use dev.yml for Read the Docs builds
• Bump QA tool versions
• Move configs from setup.cfg to pyproject.toml (except flake8 which does not support pyproject.toml)
• Fix build workflow overwriting the Python version in the mamba env during matrix testing to only the Python version in ci.yml

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

If applicable:

• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass with my changes (locally and CI/CD build)
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have noted that this is a breaking change for a major release (fix or feature that would cause existing functionality to not work as expected)

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (792cdbd) 100.00% compared to head (96d4fe7) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #512   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           15        15           
  Lines         1517      1517           
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  Hits          1517      1517           

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