fix(deps): update module github.com/xanzy/go-gitlab to v0.115.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
github.com/xanzy/go-gitlab	v0.114.0 -> v0.115.0

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Release Notes

xanzy/go-gitlab (github.com/xanzy/go-gitlab)

v0.115.0: (deprecation)

Compare Source

This release is solely to deprecate this package in favor of https://gitlab.com/gitlab-org/api/client-go.

See the migration information in #​2060

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