Update dependency gitlab to v4.20.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
gitlab (changelog)	4.19.0 -> 4.20.1

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Release Notes

NARKOZ/gitlab (gitlab)

v4.20.1

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Bugfixes

• Fixed availability of methods for project export API

v4.20.0

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New features

• Added support for disabling two factor authentication (2FA) for the specified user #​646
• Added support for user memberships #​648
• Added total method to Gitlab::PaginatedResponse returning the count of records #​653
• Added support for user activation and deactivation #​657
• Added support for merge request diffs #​661
• Added support for project export API #​664
• Added support for group hooks API #​665
• Added support for merge trains API ##​672
• Added support for pipeline variables #​678
• Added support for runner API #​677
• Added support for the latest release #​679
• Added support for merge requests related to issue #​683
• Added support for pipeline metadata update #​685
• Added user_by_username method to search for single user #​688
• Added support for create service account and personal access tokens API #​689

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