Switch from Mambaforge to Miniforge

[pnuu]

The Mambaforge installer is deprecated, so lets switch to Miniforge.

• Closes #xxxx
• Tests added
• Tests passed
• Passes flake8 trollflow2
• Fully documented
• Add your name to AUTHORS.md if not there already

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.78%. Comparing base (73a859d) to head (d6a96a9).
Report is 79 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #214      +/-   ##
==========================================
- Coverage   95.85%   95.78%   -0.07%     
==========================================
  Files          12       12              
  Lines        2989     2989              
==========================================
- Hits         2865     2863       -2     
- Misses        124      126       +2     

Flag	Coverage Δ
unittests	95.78% <ø> (-0.07%)	⬇️

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[mraspaud]

LGTM