Regenerate poetry locks with Poetry 1.8.5

CI installs Poetry from .tool-versions (currently 1.8.5). Regenerating
the locks under Poetry 2.1.1 produced lock-version 2.1 with Poetry-2.x-
only metadata, which makes Poetry 1.8.5 fall back to a re-resolve and
defeats the deterministic install this PR depends on.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: mishushakov