chore: update to Alpine 3.20 #399

Job	Run time
docker (DIR=master)	9m 38s
docker (DIR=master VARIANT=alpine)	7m 9s
docker (DIR=27)	9m 15s
docker (DIR=27 VARIANT=slim)	7m 32s
docker (DIR=27 VARIANT=alpine)	8m 19s
docker (DIR=26)	14m 9s
docker (DIR=26 VARIANT=slim)	7m 24s
docker (DIR=26 VARIANT=alpine)	7m 51s
docker (DIR=25)	11m 51s
docker (DIR=25 VARIANT=slim)	6m 45s
docker (DIR=25 VARIANT=alpine)	7m 0s
docker (DIR=24)	10m 2s
docker (DIR=24 VARIANT=slim)	6m 18s
docker (DIR=24 VARIANT=alpine)	6m 59s
	2h 0m 12s

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