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>

Author: dan-distributive

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

@@ -233,7 +233,7 @@ jobs:
         with:
           python-version: ${{ matrix.python_version }}
       - name: Setup Poetry
-        uses: snok/install-poetry@v1.4.1
+        uses: snok/install-poetry@v1.4.2
         with:
           version: 1.8.5
       - name: Install Dependencies