docker(deps): bump alpine from 3.21.0 to 3.21.2 #1940

Job	Run time
deprovision-retrigger-image / Build image	3m 26s
environments-cleanup-image / Build image	3m 27s
kyma-environment-broker-image / Build image	3m 11s
archiver-image / Build image	2m 45s
expirator-image / Build image	3m 21s
globalaccounts-image / Build image	3m 5s
runtime-reconciler-image / Build image	3m 30s
service-binding-cleanup-image / Build image	3m 5s
schema-migrator-image / Build image	2m 31s
subaccount-cleanup-image / Build image	3m 51s
subaccount-sync-image / Build image	3m 16s
	35m 28s

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