Update dependency gitlab to v5

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
gitlab (changelog)	'4.20.1' -> '5.0.0'

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Release Notes

NARKOZ/gitlab (gitlab)

### [`v5.0.0`](https://togithub.com/NARKOZ/gitlab/releases/tag/v5.0.0) [Compare Source](https://togithub.com/NARKOZ/gitlab/compare/v4.20.1...v5.0.0) #### 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](https://togithub.com/NARKOZ/gitlab/issues/666)

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Configuration

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[yegor256]

@rultor please, try to merge, since 4 checks have passed

[rultor]

@rultor please, try to merge, since 4 checks have passed

@yegor256 OK, I'll try to merge now. You can check the progress of the merge here

[rultor]

@rultor please, try to merge, since 4 checks have passed

@yegor256 Done! FYI, the full log is here (took me 8min)