Bump flyway/flyway from 10.19-alpine to 10.21-alpine in /db-init #4314

Job	Run time
nondraft-pr	1s
lint-and-test / test-python	3m 15s
lint-and-test / test-java	4m 37s
lint-and-test / test-ruby	11s
codeql / Analyze (python)	3m 29s
codeql / Analyze (java)	5m 21s
codeql / Analyze (ruby)	3m 33s
container-healthchecks / container-healthcheck	1m 28s
svc-bgs-api / integration-test	1m 56s
ee-ep-merge-end-to-end / integration-test	1m 40s
svc-bie-kafka-end-to-end / integration-test	2m 30s
svc-bip-api / integration-test	2m 8s
	30m 9s

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