Release 2.12.0

[cstns]

• Update CHANGELOG for 2.12.0
• Update version to 2.12.0

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.61%. Comparing base (937a83b) to head (327e095).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4947   +/-   ##
=======================================
  Coverage   78.61%   78.61%           
=======================================
  Files         325      325           
  Lines       15311    15311           
  Branches     3518     3518           
=======================================
  Hits        12037    12037           
  Misses       3274     3274           

Flag	Coverage Δ
backend	78.61% <ø> (ø)

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