Release v0.19.0: Update pyproject.toml and release checklist

[lewisblake]

Change Summary

Prep for release of v0.19.0

Related issue number

NA

Checklist

• Start with a draft-PR
• The PR title is a good summary of the changes
• PR is set to AeroTools and a tentative milestone
• Documentation reflects the changes where applicable
• Tests for the changes exist where applicable
• Tests pass locally
• Tests pass on CI
• At least 1 reviewer is selected
• Make PR ready to review

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.25%. Comparing base (79d1b65) to head (af621d8).
Report is 504 commits behind head on main-dev.

Additional details and impacted files

@@            Coverage Diff            @@
##           main-dev    #1189   +/-   ##
=========================================
  Coverage     79.24%   79.25%           
=========================================
  Files           129      129           
  Lines         20213    20220    +7     
=========================================
+ Hits          16018    16025    +7     
  Misses         4195     4195           

Flag	Coverage Δ
unittests	79.25% <ø> (+<0.01%)	⬆️

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[thorbjoernl]