Update Ruby dependencies

This MR contains the following updates:

Package	Update	Change
gitlab-dangerfiles	minor	'~> 3.6.6' -> '~> 3.7.0'
gitlab_kramdown	minor	'~> 0.24.0' -> '~> 0.25.0'

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

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