feat(duo): support Duo CLI v9 auto-updates

Tomas Vikrequested to merge
tv/2026-07/duo-9 into main

What does this MR do?

Bumps duoMaxCompatibleMajorVersion from 8 to 9 so future glab versions auto-download and update to Duo CLI major version 9.

Fixes #8386 (closed)

Edited by Tomas Vik

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