chore(deps): update alpine docker tag to v3.21.3

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change
alpine	final	patch	3.21.2 -> 3.21.3
alpine	stage	patch	3.21.2 -> 3.21.3

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.03%. Comparing base (ce0f543) to head (de7c1b8).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6732      +/-   ##
==========================================
- Coverage   96.06%   96.03%   -0.03%     
==========================================
  Files         364      364              
  Lines       20696    20696              
==========================================
- Hits        19881    19876       -5     
- Misses        622      626       +4     
- Partials      193      194       +1     

Flag	Coverage Δ
badger_v1	9.76% <ø> (ø)
badger_v2	1.82% <ø> (ø)
cassandra-4.x-v1-manual	14.81% <ø> (ø)
cassandra-4.x-v2-auto	1.81% <ø> (ø)
cassandra-4.x-v2-manual	1.81% <ø> (ø)
cassandra-5.x-v1-manual	14.81% <ø> (ø)
cassandra-5.x-v2-auto	1.81% <ø> (ø)
cassandra-5.x-v2-manual	1.81% <ø> (ø)
elasticsearch-6.x-v1	19.15% <ø> (ø)
elasticsearch-7.x-v1	19.23% <ø> (ø)
elasticsearch-8.x-v1	19.40% <ø> (ø)
elasticsearch-8.x-v2	1.82% <ø> (ø)
grpc_v1	10.81% <ø> (ø)
grpc_v2	7.80% <ø> (ø)
kafka-3.x-v1	10.13% <ø> (ø)
kafka-3.x-v2	1.82% <ø> (ø)
memory_v2	1.82% <ø> (ø)
opensearch-1.x-v1	19.28% <ø> (ø)
opensearch-2.x-v1	19.28% <ø> (ø)
opensearch-2.x-v2	1.82% <ø> (-0.12%)	⬇️
tailsampling-processor	0.48% <ø> (ø)
unittests	94.92% <ø> (-0.03%)	⬇️

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