Drop Python 3.9; Test on Python 3.13; drop NumPy 1.21; skip CUDA install #274

	name: CI
	on: [push, pull_request]
	jobs:
	check-ruff:
	runs-on: ubuntu-latest
	continue-on-error: true
	steps:
	- uses: actions/checkout@v4
	- name: Install Python
	uses: actions/setup-python@v5
	with:
	python-version: "3.11"
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install ruff
	# Update output format to enable automatic inline annotations.
	- name: Run Ruff
	run: ruff check --output-format=github .

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