tests: ignore mpl deprecations

[tlambert03]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.55%. Comparing base (fee8ac4) to head (66006a8).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #131      +/-   ##
==========================================
+ Coverage   95.36%   95.55%   +0.18%     
==========================================
  Files         168      168              
  Lines        2181     2181              
==========================================
+ Hits         2080     2084       +4     
+ Misses        101       97       -4     

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