Upgrade notice goes to stdout, which breaks completion
## The problem
Reported in Astronomer: Upgrade notice goes to stdout, which breaks completion.
## The fix
[kushalmalani (commenter)]: Fixed in Astro CLI 1.27.0: the upgrade notice now goes to stderr instead of stdout, so astro completion output is clean again. If you are on an older version, either upgrade, or silence the notice with astro config set -g upgrade_message false.