fix/avoid_xp_fmax

[Oisin-M]

Description

xp.fmax and xp.fmin are not part of the array-api-spec. Part of #61.

Contributor Declaration

By opening this pull request, I affirm the following:

• All authors agree to the Contributor License Agreement.
• The code follows the project's coding standards.
• I have performed self-review and added comments where needed.
• I have added or updated tests to verify that my changes are effective and functional.
• I have run all existing tests and confirmed they pass.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.58%. Comparing base (840b4b5) to head (04d7fd6).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop      #62   +/-   ##
========================================
  Coverage    99.58%   99.58%           
========================================
  Files           14       14           
  Lines          962      962           
  Branches        15       15           
========================================
  Hits           958      958           
  Misses           2        2           
  Partials         2        2           

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[Oisin-M]

Test failures are downstream and unrelated to any changes in this PR