chore(deps): update module gitlab.com/gitlab-org/api/client-go/v2 to v2.21.0

This MR contains the following updates:

Package	Type	Update	Change
gitlab.com/gitlab-org/api/client-go/v2	require	minor	v2.20.1 -> v2.21.0

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Release Notes

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

v2.21.0

Compare Source

2.21.0

🚀 Features

• Add BulkImports API functions and tests (!2846) by Kalyaan Kanugula

🔄 Other Changes

• Add missing URLVariables attribute to group_hooks (!2866) by Mark Nessen
• docs: fix incorrect phrase 'to that' -> 'so' (!2861) by Bob Singh
• docs: fix missing 'of' in contributing guide (!2860) by Bob Singh
• style: remove duplicated wording in Go version sentence (!2859) by Bob Singh

2.21.0 (2026-04-27)

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