Version 1.16.0rc0

[mwouts]

In this PR we

• bump the version number for the jupyterlab-jupytext extension to 1.4.1
• update the CHANGELOG.md
• and setup a new CI build that will test Jupytext and its extension against the pre-release versions of Python dependencies

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7522609) 97.61% compared to head (3d7ad6a) 97.73%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1176      +/-   ##
==========================================
+ Coverage   97.61%   97.73%   +0.11%     
==========================================
  Files          29       29              
  Lines        4452     4452              
==========================================
+ Hits         4346     4351       +5     
+ Misses        106      101       -5     

Flag	Coverage Δ
external	75.10% <ø> (-0.12%)	⬇️
functional	88.54% <ø> (ø)
integration	77.36% <ø> (ø)
unit	66.62% <ø> (ø)

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