Added matrix with Python versions 3.9-3.12 #257

	# This is a basic workflow to help you get started with Actions

	name: Build Sphinx Documentation

	# Controls when the action will run. Triggers the workflow on push or pull request
	# events but only for the master branch
	on: [push, pull_request]

	# A workflow run is made up of one or more jobs that can run sequentially or in parallel
	jobs:
	# This workflow contains a single job called "build"
	build:
	# The type of runner that the job will run on
	runs-on: ubuntu-latest

	# Steps represent a sequence of tasks that will be executed as part of the job
	steps:
	# Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
	- uses: actions/checkout@v2

	# Run a sphinx build test
	- name: Sphinx Build
	uses: ammaraskar/sphinx-action@0.4
	with:
	# The folder containing your sphinx docs.
	docs-folder: "docs/sphinx/" # default is docs/
	# The command used to build your documentation.
	build-command: make html # optional, default is make html
	# Pre-build command
	pre-build-command: "apt-get update -y && apt-get install -y gcc && pip install .[docs]"

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