CI: use Python 3.10 as default version #224

	name: Linkcheck

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

	jobs:
	build:

	runs-on: ubuntu-latest
	env:
	sphinx-version: '5.*'
	python-version: '3.10'

	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 ${{ env.sphinx-version }}
	run: \|
	python -V
	python -m pip install --upgrade pip
	pip install "sphinx==${{ env.sphinx-version }}"
	pip install "jinja2<3.1"

	- name: Test for broken links
	run: \|
	python -m sphinx docs/ docs/_build/ -b linkcheck -W -C

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