REL: Update version to 1.2.2

[Gui-FernandesBR]

Pull request type

• Other (please describe): Release PR

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)

New behavior

Another version of RocketPy!

Breaking change

• No

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.58%. Comparing base (0829a77) to head (864fd6d).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #574   +/-   ##
=======================================
  Coverage   72.58%   72.58%           
=======================================
  Files          59       59           
  Lines        9576     9576           
=======================================
  Hits         6951     6951           
  Misses       2625     2625           

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[phmbressan]

Versioning bump and CHANGELOG dating: I don't think we have missed anything. Let's go!