Update dependency gitlab to v4.20.1

[renovate[bot]]

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`](https://togithub.com/NARKOZ/gitlab/releases/tag/v4.20.1) [Compare Source](https://togithub.com/NARKOZ/gitlab/compare/v4.20.0...v4.20.1) #### Bugfixes - Fixed availability of methods for project export API ### [`v4.20.0`](https://togithub.com/NARKOZ/gitlab/releases/tag/v4.20.0) [Compare Source](https://togithub.com/NARKOZ/gitlab/compare/v4.19.0...v4.20.0) #### New features - Added support for disabling two factor authentication (2FA) for the specified user [#​646](https://togithub.com/NARKOZ/gitlab/issues/646) - Added support for user memberships [#​648](https://togithub.com/NARKOZ/gitlab/issues/648) - Added `total` method to `Gitlab::PaginatedResponse` returning the count of records [#​653](https://togithub.com/NARKOZ/gitlab/issues/653) - Added support for user activation and deactivation [#​657](https://togithub.com/NARKOZ/gitlab/issues/657) - Added support for merge request diffs [#​661](https://togithub.com/NARKOZ/gitlab/issues/661) - Added support for project export API [#​664](https://togithub.com/NARKOZ/gitlab/issues/664) - Added support for group hooks API [#​665](https://togithub.com/NARKOZ/gitlab/issues/665) - Added support for merge trains API #[#​672](https://togithub.com/NARKOZ/gitlab/issues/672) - Added support for pipeline variables [#​678](https://togithub.com/NARKOZ/gitlab/issues/678) - Added support for runner API [#​677](https://togithub.com/NARKOZ/gitlab/issues/677) - Added support for the latest release [#​679](https://togithub.com/NARKOZ/gitlab/issues/679) - Added support for merge requests related to issue [#​683](https://togithub.com/NARKOZ/gitlab/issues/683) - Added support for pipeline metadata update [#​685](https://togithub.com/NARKOZ/gitlab/issues/685) - Added `user_by_username` method to search for single user [#​688](https://togithub.com/NARKOZ/gitlab/issues/688) - Added support for create service account and personal access tokens API [#​689](https://togithub.com/NARKOZ/gitlab/issues/689)

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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)