Remove OTP24 from GH actions (#507) #445

Job	Run time
docker (DIR=28)	4m 37s
docker (DIR=27)	3m 43s
docker (DIR=master)	9m 15s
docker (DIR=25)	11m 18s
docker (DIR=26 VARIANT=slim)	6m 57s
docker (DIR=27 VARIANT=alpine)	3m 8s
docker (DIR=28 VARIANT=slim)	3m 0s
docker (DIR=master VARIANT=alpine)	6m 39s
docker (DIR=28 VARIANT=alpine)	3m 27s
docker (DIR=25 VARIANT=alpine)	6m 42s
docker (DIR=26 VARIANT=alpine)	7m 36s
docker (DIR=26)	12m 44s
docker (DIR=25 VARIANT=slim)	6m 6s
docker (DIR=27 VARIANT=slim)	2m 48s
	1h 28m 0s

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