Update VERSION to 2.1.2

[AndreKurait]

This PR updates the VERSION file to 2.1.2.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.49%. Comparing base (a7f4c1e) to head (44df119).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #1215   +/-   ##
=========================================
  Coverage     80.49%   80.49%           
  Complexity     3079     3079           
=========================================
  Files           421      421           
  Lines         15650    15650           
  Branches       1057     1057           
=========================================
  Hits          12598    12598           
  Misses         2408     2408           
  Partials        644      644           

Flag	Coverage Δ
unittests	80.49% <ø> (ø)

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