tests: Add verbose flag to CIBW pytest command

Add `-v` to the pytest command in tests/pyproject.toml to help
diagnose hanging tests in CIBW jobs (particularly iOS).

This will show each test name as it runs, making it easier to
identify which specific test is hanging.

Author: rwgk

tests/pyproject.toml

@@ -27,7 +27,7 @@ PYBIND11_FINDPYTHON = true
 
 [tool.cibuildwheel]
 test-sources = ["tests", "pyproject.toml"]
-test-command = "python -m pytest -o timeout=0 -p no:cacheprovider tests"
+test-command = "python -m pytest -v -o timeout=0 -p no:cacheprovider tests"
 environment.PIP_ONLY_BINARY = "numpy"
 environment.PIP_PREFER_BINARY = "1"