test: pass a list, not a generator, to parametrize in test_docs

[d-v-b]

🤖 AI text below 🤖

What

tests/test_docs.py::test_docstrings passes the find_examples(...) generator directly to @pytest.mark.parametrize. Materialize it to a list, matching the existing list(find_examples(...)) usage a few lines up in the same module.

-@pytest.mark.parametrize("example", find_examples(str(SOURCES_ROOT)), ids=str)
+@pytest.mark.parametrize("example", list(find_examples(str(SOURCES_ROOT))), ids=str)

Why

pytest 9.1 deprecated passing a non-Collection iterable (e.g. a generator) to parametrize, emitting PytestRemovedIn10Warning. Because this repo sets filterwarnings = ["error"], that deprecation is promoted to a hard error at collection time:

ERROR collecting tests/test_docs.py
E   pytest.PytestRemovedIn10Warning: Passing a non-Collection iterable to parametrize is deprecated.
E   Test: tests/test_docs.py::test_docstrings, argvalues type: generator
Interrupted: 1 error during collection

This is the sole blocker for the pytest 9.0.3 → 9.1.1 bump in the python-dependencies group update (#4137): in that run every job passes except doctests, which is the only env that installs pytest-examples and therefore actually collects this module (every other env skips it via importorskip).

Verification

Under pytest==9.1.1 with pytest-examples installed:

• before: no tests collected, 1 error in 0.11s (reproduces the CI failure)
• after: 60 tests collected, no error

🤖 Generated with Claude Code

[d-v-b]

merging this as soon as tests pass