Update gitaly languages spec
What does this MR do and why?
Language detection has been updated in gitaly!4580 (merged), and this has caused some slight changes to the language ratios. This is blocking the gitaly release. !92133 (merged)
I've made sure that the newly updated spec passes both on the release branch and on master.
Modernises the spec for additional clarity.
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.