Add support for Python 3.13 #457

	name: Documentation building
	on:
	schedule:
	- cron: "0 0 * * 3"
	push:
	branches:
	- main
	pull_request:
	branches:
	- main
	paths:
	- .github/workflows/docs.yml
	- "src/**"
	- "doc/**"
	- pyproject.toml

	jobs:
	docs:
	name: Docs building
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- name: Get history and tags for SCM versioning to work
	run: \|
	git fetch --prune --unshallow
	git fetch --depth=1 origin +refs/tags/:refs/tags/
	- name: Set up Python
	uses: actions/setup-python@v5
	with:
	python-version: '3.x'
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	python -m pip install tox
	- name: Build documentation
	env:
	TOXENV: docs
	run: \|
	tox

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