Release 2.9.0

[cstns]

• Update CHANGELOG for 2.9.0
• Update version to 2.9.0

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.30%. Comparing base (ea58fc2) to head (901a5ec).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4575   +/-   ##
=======================================
  Coverage   78.30%   78.30%           
=======================================
  Files         302      302           
  Lines       14355    14355           
  Branches     3263     3263           
=======================================
  Hits        11240    11240           
  Misses       3115     3115           

Flag	Coverage Δ
backend	78.30% <ø> (ø)

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