Bump snok/install-poetry to v1.4.2 (fixes v1.5.0 release CI) (#517)

* Bump snok/install-poetry to v1.4.2

install.python-poetry.org now returns 403 to Python-urllib's User-Agent,
which v1.4.1 uses on Linux and macOS. v1.4.2 fetches a pinned installer
from raw.githubusercontent.com instead.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* Keep snok/install-poetry v1.4.1 on Windows

v1.4.2's installer cannot create its venv on Windows + Python 3.8 under
bash (snok/install-poetry#94). v1.4.1 uses the legacy installer there,
which still downloads fine.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

Author: dan-distributive

.github/workflows/test-and-publish.yaml

@@ -233,6 +233,14 @@ jobs:
         with:
           python-version: ${{ matrix.python_version }}
       - name: Setup Poetry
+        if: ${{ runner.os != 'Windows' }}
+        uses: snok/install-poetry@v1.4.2
+        with:
+          version: 1.8.5
+      # v1.4.2's installer fails to create its venv on Windows + Python 3.8 under bash
+      # (snok/install-poetry#94); v1.4.1 uses the legacy installer on Windows.
+      - name: Setup Poetry (Windows)
+        if: ${{ runner.os == 'Windows' }}
         uses: snok/install-poetry@v1.4.1
         with:
           version: 1.8.5