BUG: wrong rocket mass in parachute u dot method

[Gui-FernandesBR]

Pull request type

• Code changes (bugfix, features)

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 tests -m slow --runslow) have passed locally
• CHANGELOG.md has been updated (if relevant)

Current behavior

When calculating the parachute forces in the Flight.u_dot_parachute method, the code is using the rocket's mass without the motor's dry mass. It should be using the Rocket.dry_mass value instead.

New behavior

Fixed the bug, updated docs and tests.

Breaking change

• No (but you should expect some slight change in impact velocity values since the v1.0 was out).

Additional information

• Quick obs.: Acceptance tests should prevent bugs like this, @lucasfourier @GabrielBarberini !!
• This bug was captured today by the Faraday team, Spain. Many thanks to their contribution!
  

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.58%. Comparing base (474eb49) to head (0829a77).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #569   +/-   ##
=======================================
  Coverage   72.58%   72.58%           
=======================================
  Files          59       59           
  Lines        9576     9576           
=======================================
  Hits         6951     6951           
  Misses       2625     2625           

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