Prepare changelog for 1.43.0 release

[jack-berg]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.11%. Comparing base (b6badb2) to head (cf88715).
Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6782      +/-   ##
============================================
+ Coverage     90.09%   90.11%   +0.02%     
- Complexity     6544     6546       +2     
============================================
  Files           728      728              
  Lines         19702    19702              
  Branches       1935     1935              
============================================
+ Hits          17750    17755       +5     
+ Misses         1349     1347       -2     
+ Partials        603      600       -3     

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[jkwatson]

Thanks!