MNT: Update interpolation method in linearly_interpolated_func

[Gui-FernandesBR]

linearly_interpolated_func

Pull request type

• Code changes (bugfix, features)
• Code maintenance (refactoring, formatting, tests)
• ReadMe, Docs and GitHub updates
• Other (please describe):

Checklist

• Tests for the changes have been added (if needed)
• Docs have been reviewed and added / updated
• Lint (black rocketpy/ tests/) has passed locally
• All tests (pytest --runslow) have passed locally
• CHANGELOG.md has been updated (if relevant)

Current behavior

I found this bug on a pytest fixture.

New behavior

The linearly_interpolated_func fixture is now using the linear interpolation method
Updated the docstring as well.

Breaking change

• Yes
• No

Additional information

the tests are passing even if adter the change

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (13204ce) 71.17% compared to head (9b9f7b5) 71.17%.
Report is 7 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #504   +/-   ##
========================================
  Coverage    71.17%   71.17%           
========================================
  Files           55       55           
  Lines         9277     9277           
========================================
  Hits          6603     6603           
  Misses        2674     2674           

Flag	Coverage Δ
unittests	71.17% <ø> (ø)

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