Update octokit from 4.21.0 to 4.25.1 in /qa

What does this MR do and why?

Updates octokit gem from 4.21.0 to 4.25.1 in /qa, which allows us to use Faraday v2 in qa in the future.

Changes in the upstream: https://github.com/octokit/octokit.rb/compare/v4.21.0...v4.25.1

Part of #369862 (closed)

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