Update docker images to Alpine 3.21 #1593

Job	Run time
static-analysis (8.3, cs)	50s
static-analysis (8.3, stan)	36s
static-analysis (8.3, openapi:validate)	40s
api-tests / tests (8.3)	1m 49s
api-tests / tests (8.4)	1m 17s
cli-tests / tests (8.3)	4m 54s
cli-tests / tests (8.4)	1m 8s
unit-tests / tests (8.3)	38s
unit-tests / tests (8.4)	48s
db-tests (maria) / db-tests (8.3)	51s
db-tests (ms) / db-tests (8.3)	3m 59s
db-tests (maria) / db-tests (8.4)	2m 41s
db-tests (ms) / db-tests (8.4)	3m 5s
db-tests (mysql) / db-tests (8.3)	51s
db-tests (postgres) / db-tests (8.3)	49s
db-tests (mysql) / db-tests (8.4)	45s
db-tests (sqlite:ci) / db-tests (8.3)	2m 56s
db-tests (postgres) / db-tests (8.4)	3m 37s
db-tests (sqlite:ci) / db-tests (8.4)	1m 19s
upload-coverage (8.3)	1m 12s
delete-artifacts	2s
	34m 47s

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