restrict matplotlib>=3.8

[AdamOrmondroyd]

Description

Restrict to matplotlib>=3.8.0 due to api change. We (I) updated the fgivenx api in #26, but didn't restrict the setup.py (as it was back then) accordingly.

Somewhat helps wth #35 but the feedstock will still need fiddling

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

I guess technically this is a breaking change, though it feels more like a broken change. smh my head

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (6de719a) to head (51935a0).

Additional details and impacted files

@@            Coverage Diff            @@
##            master       #36   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           19        19           
  Lines          861       861           
=========================================
  Hits           861       861           

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