fix pipleine breaking becaus of `pipx` not loading constraints.txt #456

	---
	name: Documentation

	"on":
	schedule:
	- cron: "0 0 * * 0" # every week at midnight
	push:
	paths:
	- "**.md"
	- "docs/**"
	- ".github/workflows/documentation.yml"
	pull_request:
	paths:
	- "**.md"
	- "docs/**"
	- ".github/workflows/documentation.yml"

	jobs:
	docs:
	name: Build documentation & check links
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- uses: actions/setup-python@v5
	with:
	python-version: "3.12"

	- name: Upgrade pip
	run: \|
	pip install --constraint=.github/workflows/constraints.txt pip
	pip --version
	- name: Install Poetry
	run: \|
	pipx install --pip-args=--constraint=.github/workflows/python-constraints.txt poetry
	poetry --version
	- name: Install Nox
	run: \|
	pipx install --pip-args=--constraint=.github/workflows/constraints.txt nox
	pipx inject --pip-args=--constraint=.github/workflows/constraints.txt nox nox-poetry
	nox --version
	- name: Build documentation
	run: nox --force-color --session=docs-build

	- name: Upload documentation
	uses: actions/upload-artifact@v3
	with:
	name: docs
	path: docs/_build

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