Upgrade to alpine 3.21 (#254) #893

Job	Run time
build-docker-image / build-image	3m 16s
feature-tests-go / test	2m 35s
feature-tests-dotnet / test	1m 30s
feature-tests-java / test	2m 10s
feature-tests-python / test	1m 37s
feature-tests-ts / test	2m 18s
	13m 26s

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