Prepare for release, 4.3.0.

[dblock]

Description

Part of #628.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.06%. Comparing base (06a6dc8) to head (54d0a15).
Report is 75 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #633       +/-   ##
===========================================
+ Coverage   57.29%   68.06%   +10.76%     
===========================================
  Files         315      376       +61     
  Lines        9823     8867      -956     
===========================================
+ Hits         5628     6035      +407     
+ Misses       2902     1552     -1350     
+ Partials     1293     1280       -13     

Flag	Coverage Δ
integration	60.32% <ø> (+9.48%)	⬆️
unit	15.48% <ø> (+2.63%)	⬆️

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see 274 files with indirect coverage changes