CI: Add optional dependency for examples

The Game of Life fast example needs scipy. Instead of adding it to our dev dependencies, I created a new, lighter examples optional dependency category (with SciPy)

.github/workflows/build_lint.yml

@@ -77,7 +77,7 @@ jobs:
     - name: Install uv
       run: pip install uv
     - name: Install Mesa
-      run: uv pip install --system .[dev]
+      run: uv pip install --system .[examples]
     - name: Checkout mesa-examples
       uses: actions/checkout@v4
       with:

pyproject.toml

@@ -54,6 +54,10 @@ dev = [
   "sphinx",
   "pytest-mock",
 ]
+examples = [
+  "pytest >= 4.6",
+  "scipy"
+]
 docs = [
   "sphinx",
   "ipython",