chore(deps): update alpine docker tag to v3.21.2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
alpine	final	minor	3.18.3 -> 3.21.2

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.72%. Comparing base (9089164) to head (3ce04a0).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #247   +/-   ##
=======================================
  Coverage   72.72%   72.72%           
=======================================
  Files          38       38           
  Lines        3733     3733           
=======================================
  Hits         2715     2715           
  Misses        760      760           
  Partials      258      258           

Flag	Coverage Δ
unittests	72.72% <ø> (ø)

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