Update dependency for hdrhistogram

A dependency for: https://gitlab.com/gitlab-org/gitaly/-/blob/master/go.sum#L55

has changed from: https://github.com/codahale/hdrhistogram to https://github.com/HdrHistogram/hdrhistogram-go

Please see also these two issues: https://github.com/HdrHistogram/hdrhistogram-go/issues/32 https://github.com/HdrHistogram/hdrhistogram-go/issues/30

Thanks.

Edited May 04, 2021 by Nick Thomas

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