Update Ruby to 2.7.5
What does this MR do and why?
This MR updates Ruby to 2.7.5 and marries up with omnibus-gitlab#6537 (closed).
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.
Related to #347190 (closed)
Edited by Ash McKenzie