Update matplotlib requirement from <3.8 to <3.9 #2923

	# Workflow which runs all Jupyter notebooks of the documentation and fails on errors.
	name: Jupyter Notebooks

	on:
	# Triggers the workflow on push or pull request
	push:
	pull_request:

	# Allows you to run this workflow manually from the Actions tab
	workflow_dispatch:

	jobs:
	run_notebooks:
	runs-on: ubuntu-latest
	steps:
	- name: Set up Git repository
	uses: actions/checkout@v2
	- name: Set up Python
	uses: actions/setup-python@v2
	with:
	python-version: "3.9"

	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	sudo apt-get update
	sudo apt-get install $(cat apt.txt)
	pip install -r docs/requirements.txt
	pip install .

	- name: Execute all notebooks with nbconvert
	run: \|
	for file in $(find -wholename "./docs/source/*/.ipynb" -not -path "*/.ipynb_checkpoints/")
	do
	jupyter nbconvert --to notebook --execute --ExecutePreprocessor.kernel_name=python3 $file
	done

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