bump otp versions (#502) #433

Job	Run time
docker (DIR=master)	9m 6s
docker (DIR=master VARIANT=alpine)	6m 38s
docker (DIR=28)	4m 0s
docker (DIR=28 VARIANT=slim)	3m 9s
docker (DIR=28 VARIANT=alpine)	3m 22s
docker (DIR=27)	3m 39s
docker (DIR=27 VARIANT=slim)	2m 49s
docker (DIR=27 VARIANT=alpine)	3m 8s
docker (DIR=26)	12m 39s
docker (DIR=26 VARIANT=slim)	6m 57s
docker (DIR=26 VARIANT=alpine)	7m 21s
docker (DIR=25)	11m 11s
docker (DIR=25 VARIANT=slim)	6m 4s
docker (DIR=25 VARIANT=alpine)	6m 32s
docker (DIR=24)	9m 24s
docker (DIR=24 VARIANT=slim)	5m 46s
docker (DIR=24 VARIANT=alpine)	6m 24s
	1h 48m 9s

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