Handle Sphinx dependency for Python 3.8 (Sphinx 7.2 no longer support… #751

	name: type checking
	on:
	push:
	pull_request:
	pull_request_target:

	jobs:
	run:
	runs-on: ubuntu-latest

	env:
	DJANGO_CA_SECRET_KEY: dummy

	steps:

	- name: Acquire sources
	uses: actions/checkout@v3.1.0

	- name: Setup Python
	uses: actions/setup-python@v4.3.0
	with:
	python-version: 3.11
	architecture: x64

	- name: Apply caching of dependencies
	uses: actions/cache@v3.0.11
	with:
	path: ~/.cache/pip
	key: pip-${{ hashFiles('*/requirements-.txt') }}

	- name: Install dependencies
	run: \|
	pip install -U pip setuptools wheel
	pip install -r requirements.txt -r requirements/requirements-mypy.txt

	- name: run mypy
	run: mypy .

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