chore(deps): update dependency gitlab to v5

This MR contains the following updates:

Package	Update	Change
gitlab (changelog)	major	'~> 4.20.1' -> '~> 5.0.0'

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Release Notes

NARKOZ/gitlab (gitlab)

v5.0.0

Compare Source

General improvements

• Dropped Ruby 2.6 support
• Dropped Ruby 2.7 support
• Dropped Ruby 3.0 support
• Added support for Ruby 3.3

New features

• Added support for group access tokens #​666

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