Bump development Ruby version to 3.3.7

Nao Hashizumerequested to merge
naohashizume/update-ruby-to-3.3.7 into master

What does this MR do and why?

This MR updates Ruby to 3.3.7 as the development version.

Related to gitlab-development-kit#2369 (closed)

MR acceptance checklist

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

How to set up and validate locally

  1. gdk config set gitlab.default_branch naohashizume/update-ruby-to-3.3.7
  2. gdk update
Edited by Nao Hashizume

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