CI: use Python 3.10 as default version #223

	name: Sphinx

	on:
	push:
	branches: [ main ]
	pull_request:
	branches: [ main ]

	jobs:
	build:

	runs-on: ubuntu-latest
	env:
	python-version: '3.10'
	strategy:
	matrix:
	sphinx-version: [ 1.6.7, 1.8.6, 2.4.5, 3.5.4, 4.5.0 ]

	steps:
	- uses: actions/checkout@v3

	- name: Set up Python ${{ env.python-version }}
	uses: actions/setup-python@v4
	with:
	python-version: ${{ env.python-version }}

	- name: Set up Sphinx ${{ matrix.sphinx-version }}
	run: \|
	python -V
	python -m pip install --upgrade pip
	pip install "sphinx==${{ matrix.sphinx-version }}"
	pip install "docutils<0.17"
	pip install "jinja2<3.1"

	- name: Tests
	run: \|
	python -m sphinx tests tests/_build/ -b html -W -C -D master_doc=index -D extensions=sphinxcontrib.katex
	python -m sphinx tests tests/_build/ -c docs/ -b latex -W

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