chore(deps): update alpine docker tag to v3.21.1

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change
alpine	final	patch	3.21.0 -> 3.21.1
alpine	stage	patch	3.21.0 -> 3.21.1

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.29%. Comparing base (10af185) to head (acb68b0).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6496      +/-   ##
==========================================
+ Coverage   96.25%   96.29%   +0.03%     
==========================================
  Files         372      372              
  Lines       21282    21282              
==========================================
+ Hits        20485    20493       +8     
+ Misses        609      603       -6     
+ Partials      188      186       -2     

Flag	Coverage Δ
badger_v1	10.67% <ø> (ø)
badger_v2	2.78% <ø> (ø)
cassandra-4.x-v1-manual	16.57% <ø> (ø)
cassandra-4.x-v2-auto	2.71% <ø> (ø)
cassandra-4.x-v2-manual	2.71% <ø> (ø)
cassandra-5.x-v1-manual	16.57% <ø> (ø)
cassandra-5.x-v2-auto	2.71% <ø> (ø)
cassandra-5.x-v2-manual	2.71% <ø> (ø)
elasticsearch-6.x-v1	20.23% <ø> (-0.01%)	⬇️
elasticsearch-7.x-v1	20.30% <ø> (ø)
elasticsearch-8.x-v1	20.46% <ø> (-0.01%)	⬇️
elasticsearch-8.x-v2	2.77% <ø> (ø)
grpc_v1	12.31% <ø> (ø)
grpc_v2	9.09% <ø> (ø)
kafka-3.x-v1	10.35% <ø> (ø)
kafka-3.x-v2	2.78% <ø> (ø)
memory_v2	2.78% <ø> (+<0.01%)	⬆️
opensearch-1.x-v1	20.36% <ø> (ø)
opensearch-2.x-v1	20.35% <ø> (ø)
opensearch-2.x-v2	2.78% <ø> (+<0.01%)	⬆️
tailsampling-processor	0.51% <ø> (ø)
unittests	95.16% <ø> (+0.03%)	⬆️

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