chore(deps): update module gitlab.com/gitlab-org/api/client-go/v2 to v2.51.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
gitlab.com/gitlab-org/api/client-go/v2	v2.50.0 → v2.51.0

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Release Notes

gitlab-org/api/client-go (gitlab.com/gitlab-org/api/client-go/v2)

v2.51.0

Compare Source

2.51.0

🚀 Features

• feat(client): add option to retry only idempotent requests (!2945) by Patrick Dawkins

🔄 Other Changes

• feat(workitems): Add Children field to WorkItem struct. (!2950) by Florian Forster

2.51.0 (2026-07-17)

Features

• client: add option to retry only idempotent requests (8260b22)
• workitems: Add Children field to WorkItem struct. (6a5eca2)

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