Update cibuildwheel to v2.21.3 #396

	# This is a basic workflow to help you get started with Actions

	name: Test PyGLM on various systems and Python versions

	# Controls when the workflow will run
	on: [push, pull_request, workflow_dispatch]

	# A workflow run is made up of one or more jobs that can run sequentially or in parallel
	jobs:
	test-build:
	# The type of runner that the job will run on
	runs-on: ${{ matrix.os }}
	strategy:
	matrix:
	os: [ubuntu-latest, macos-latest, windows-latest]
	python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]

	# Steps represent a sequence of tasks that will be executed as part of the job
	steps:
	- uses: actions/checkout@v4
	with:
	submodules: recursive
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v5
	with:
	python-version: ${{ matrix.python-version }}
	- name: Install pip, build and pytest
	run: \|
	python -m pip install pip --upgrade
	pip install pytest
	pip install build
	- name: Build PyGLM
	run: python -m build
	- name: Install PyGLM
	run: python -c "import os, glob, subprocess; wheels = glob.glob('dist/*.whl'); subprocess.check_call(['pip', 'install', wheels[0]])"
	- name: Test with pytest
	run: pytest test/PyGLM_test.py -v

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