chore(deps): update dependency gitlab to v6

This MR contains the following updates:

Package	Change	Age	Confidence
gitlab (changelog)	'~> 4.19' -> '~> 6.0'

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Release Notes

NARKOZ/gitlab (gitlab)

v6.0.0

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General improvements

• Dropped Ruby 3.1 support
• Added support for Ruby 3.4 #​708

New features

• Added body_as_json configuration parameter #​712
• Added support for remote mirrors API #​704
• Added support for additional options in group members API #​713
• Added support for additional options in registry repositories API #​710

v5.1.0

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General improvements

• Added base64 to dependencies #​697

Bugfixes

• Fixed masking short and known private tokens #​692
• Fixed pagination options for merge request discussions #​694

New features

• Added support for programming languages used in a project #​695
• Added support for merge request dependencies #​698
• Added support for pipelines triggered by a pipeline schedule in a project #​699
• Added support for using CI/CD job token for authentication #​700
• Added support for project access tokens API #​701

v5.0.0

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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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