refactor(duo): improve Duo CLI update notification message

Arthur Foltzrequested to merge
chore/improve-duo-cli-update-message into main

What does this MR do?

Changes the background update notification message for Duo CLI from:

Run 'glab duo cli --update' to upgrade

to:

Run 'glab duo cli --update' to update to the latest version

The previous wording ("to upgrade") was not consistent. The new message makes it consistent with the --update flag.

Edited by Arthur Foltz

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