fix(ci): reorder `sphinx` installation #919

	name: build the documentation
	on: [push, pull_request]
	jobs:
	build:

	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v4

	- name: set up python
	uses: actions/setup-python@v5
	with:
	cache: 'pip'

	- name: install dependencies
	run: \|
	pip install ".[docs]"
	sudo apt-get -y update
	sudo apt-get -y install graphviz libclang1-11 libclang-cpp11

	- name: install doxygen from SF binary archives
	env:
	DOXYGEN_VERSION: 1.9.4
	run: \|
	mkdir doxygen-bin-arc && cd doxygen-bin-arc
	curl -L https://sourceforge.net/projects/doxygen/files/rel-$DOXYGEN_VERSION/doxygen-$DOXYGEN_VERSION.linux.bin.tar.gz > doxygen.tar.gz
	gunzip doxygen.tar.gz
	tar xf doxygen.tar
	cd doxygen-$DOXYGEN_VERSION
	sudo make install

	- name: build the documentation
	run: \|
	make html
	rm documentation/build/html/.buildinfo

	- uses: actions/upload-artifact@v2
	with:
	name: docs build artifacts
	path: \|
	documentation/build/html
	examples///xml

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