[workflows] set Poetry version to 1.8.5 when installing via snok/install-poetry

[pnilan]

What

• Poetry v2.0.0 was published on 1/5/25. The https://github.com/snok/install-poetry workflow is now installing Poetry v2.0.0 during GHA workflows, causing failures during pyproject installation due to incorrectly formatted pyproject.toml files
  • See https://github.com/airbytehq/airbyte/actions/runs/12619358567/job/35163810532 for failed run w/ 2.0.0
  • See https://github.com/airbytehq/airbyte/actions/runs/12659835322 for successful run w/ 1.8.5 using this branch
• This is a quick fix to resolve these failures until we migrate to Poetry v2.0.0.
• See https://python-poetry.org/blog/announcing-poetry-2.0.0

How

• Explictily sets the Poetry version to v1.8.5 when installing via snok/install-poetry@1:

      - name: Install Poetry
        id: install_poetry
        uses: snok/install-poetry@v1
        with:
          version: 1.8.5

Can this PR be safely reverted and rolled back?

• YES 💚
• NO ❌

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[clnoll]

LGTM @pnilan. You might consider running live or regression tests against your branch too (using a manual GHA), but since we were already running 1.8.5 I could go either way.

[pnilan]

Merged this as Poetry v2.0.0 was blocking regression tests from running.