Update dependency gitaly to '~> 18.5.1'

This MR contains the following updates:

Package	Update	Change	MyDiffEnd
gitaly (source)	minor	'~> 18.4.0.pre.rc1' -> '~> 18.5.1'	https://my.diffend.io/gems/gitaly/18.4.1/18.5.1

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Release Notes

gitlab-org/gitaly (gitaly)

v18.5.1

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v18.5.0

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v18.4.3

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v18.4.2

Compare Source

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