Fix binary reader download duration histogram (#8017) #15807

Job	Run time
Go build with -tags=stringlabels	36s
Check misspelled words	12s
Go build for different platforms	5m 23s
Thanos end-to-end tests (8, 0)	4m 54s
Linters (Static Analysis) for Go	2m 41s
Thanos end-to-end tests (8, 1)	3m 47s
Thanos unit tests	11m 9s
Thanos end-to-end tests (8, 2)	3m 48s
Thanos end-to-end tests (8, 3)	4m 18s
Thanos end-to-end tests (8, 4)	7m 34s
Thanos end-to-end tests (8, 5)	4m 14s
Thanos end-to-end tests (8, 6)	4m 48s
Thanos end-to-end tests (8, 7)	3m 53s
	57m 17s

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