chore: type annotation compatible with python39 #42

	# .github/workflows/build.yaml
	name: Python CI Build

	on:
	push:
	branches:
	- main
	pull_request:
	branches:
	- main

	jobs:
	build:
	runs-on: ubuntu-22.04
	strategy:
	matrix:
	python-version: ["3.9", "3.10", "3.11", "3.12"]
	steps:
	- name: Checkout code
	uses: actions/checkout@v3

	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v4
	with:
	python-version: ${{ matrix.python-version }}

	- name: Update pip
	run: \|
	python -m pip install --upgrade pip
	python -m pip install setuptools wheel build

	- name: Build
	run: \|
	python -m build
	pip install .

	- name: Test VaxPress
	run: \|
	python -m vaxpress --help
	python -m vaxpress --version

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