Update Ruby dependencies

This MR contains the following updates:

Package	Update	Change
gitlab_kramdown (changelog)	minor	'~> 0.28.0' -> '~> 0.29.0'
highline (changelog)	patch	'~> 3.1.0' -> '~> 3.1.1'

MR created with the help of gitlab-org/frontend/renovate-gitlab-bot

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Release Notes

gitlab-org/ruby/gems/gitlab_kramdown (gitlab_kramdown)

v0.29.0

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Changed

• Bump project version dependencies.
• Make Ruby 3.1 the minimum supported version.

JEG2/highline (highline)

v3.1.1

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• MR #​276 - Update #say to always flush the output after a #puts (@​blipper)
• MR #​274 / I #​273 (@​costa)
  • Add Highline#add_to_color_scheme
  • Dockerize the test environment. Just run bin/test and voilá!

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