Bump duo cli version to 9.29.0

Charlie Linacrerequested to merge
clinacre-bump-duo-cli-9-29-0 into main

This MR contains the following updates:

Package Update Change
duo-cli minor 9.27.0 -> 9.29.0

Companion MR required: update the runtime inventory table in doc/user/duo_agent_platform/flows/execution/images.md in gitlab-org/gitlab (see AGENTS.md).

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