fix: remove allow-prereleases, Python 3.14 is GA

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: brtkwr

.github/workflows/test.yml

@@ -28,7 +28,6 @@ jobs:
       uses: actions/setup-python@v4
       with:
         python-version: ${{ matrix.python-version }}
-        allow-prereleases: true
 
     - name: 📦 Install uv
       uses: astral-sh/setup-uv@v4