CI: Fix PyPy 3.11 build by avoiding mypy dependency

Install only test dependencies (pytest) on non-3.9 Python versions,
since mypy's librt dependency doesn't work on PyPy 3.11. The dev
dependencies (including mypy) are only needed for type checking on 3.9.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: vthorsteinsson

.github/workflows/python-package.yml

@@ -29,11 +29,14 @@ jobs:
       run: |
         python -m pip install --upgrade uv
         uv pip install --system --upgrade wheel setuptools
-        uv pip install --system ".[dev]"
+        if [ "${{ matrix.python-version }}" == "3.9" ]; then
+          uv pip install --system ".[dev]"
+        else
+          uv pip install --system ".[test]"
+        fi
 
     - name: Type check with mypy (only on oldest supported Python version)
       run: |
-        if [ "${{ matrix.python-version }}" == "3.9" ]; then python -m pip install mypy; fi
         if [ "${{ matrix.python-version }}" == "3.9" ]; then mypy --python-version=3.9 src/tokenizer; fi
 
     - name: Test with pytest

pyproject.toml

@@ -53,6 +53,9 @@ Issues = "https://github.com/mideind/Tokenizer/issues"
 Changelog = "https://github.com/mideind/Tokenizer#changelog"
 
 [project.optional-dependencies]
+test = [
+    "pytest>=7.0",
+]
 dev = [
     "pytest>=7.0",
     "pytest-cov>=4.0",