auth: v0.21.0

0.21.0 (2026-07-07)

Features

• auth: Implement updated design for regional access boundary (#13417) (fadb6c7)

Bug Fixes

• auth: Avoid double impersonation in idtoken and clarify docs (#14474) (995bfc3), closes #11105
• auth: Correct go min version (#20094) (6bb4358)