chore(deps): update alpine docker tag to v3.21.0

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change
alpine	final	minor	3.20.3 -> 3.21.0
alpine	stage	minor	3.20.3 -> 3.21.0

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.24%. Comparing base (c367225) to head (48b0a37).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6315   +/-   ##
=======================================
  Coverage   96.24%   96.24%           
=======================================
  Files         356      356           
  Lines       20432    20432           
=======================================
  Hits        19665    19665           
  Misses        581      581           
  Partials      186      186           

Flag	Coverage Δ
badger_v1	8.90% <ø> (ø)
badger_v2	1.62% <ø> (ø)
cassandra-4.x-v1-manual	14.84% <ø> (ø)
cassandra-4.x-v2-auto	1.56% <ø> (ø)
cassandra-4.x-v2-manual	1.56% <ø> (ø)
cassandra-5.x-v1-manual	14.84% <ø> (ø)
cassandra-5.x-v2-auto	1.56% <ø> (ø)
cassandra-5.x-v2-manual	1.56% <ø> (ø)
elasticsearch-6.x-v1	18.59% <ø> (-0.01%)	⬇️
elasticsearch-7.x-v1	18.67% <ø> (ø)
elasticsearch-8.x-v1	18.84% <ø> (-0.01%)	⬇️
elasticsearch-8.x-v2	1.62% <ø> (+<0.01%)	⬆️
grpc_v1	10.36% <ø> (-0.01%)	⬇️
grpc_v2	7.87% <ø> (+<0.01%)	⬆️
kafka-v1	8.58% <ø> (ø)
kafka-v2	1.62% <ø> (ø)
memory_v2	1.61% <ø> (ø)
opensearch-1.x-v1	18.72% <ø> (ø)
opensearch-2.x-v1	18.73% <ø> (ø)
opensearch-2.x-v2	1.61% <ø> (?)
tailsampling-processor	0.45% <ø> (ø)
unittests	95.15% <ø> (ø)

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