Add conformance tests for PEP 702's `@deprecated` #1134

	name: Test and lint

	on:
	push:
	pull_request:

	permissions:
	contents: read

	jobs:
	linting:
	name: Lint

	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v4
	- name: Set up Python 3
	uses: actions/setup-python@v5
	with:
	python-version: 3
	cache: "pip"
	cache-dependency-path: "test-requirements.txt"

	- name: Install dependencies
	run: \|
	pip install --upgrade pip
	pip install -r test-requirements.txt

	- name: Lint implementation
	run: flake8

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