Bump up gitaly client version to v16.7.0-rc1
What does this MR do and why?
Bump up gitaly client gem to v16.7.0-rc1
Related to gitaly!6560 (merged)
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.