Update grape gem to 2.1.0

What does this MR do and why?

This MR is extracted from Draft: Update grape gem to 2.3.0 (!184501 - closed), as it went too big.

References

• Update dependency grape to '~> 2.3.0' (#491188)

Screenshots or screen recordings

N/A

How to set up and validate locally

N/A

MR acceptance checklist

Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.