Install test dependencies through `requirements.test.txt` #2

	name: Type checks

	on: [ push, pull_request ]

	jobs:
	mypy:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	with:
	fetch-depth: 0 # Tags are needed to install DL-Registry
	- uses: actions/setup-python@v5
	with:
	python-version: '3.9'
	- name: Install dependencies and project
	run: \|
	pip install --upgrade pip
	pip install -r requirements.dev.txt
	pip install .[dev]
	- name: Run mypy
	run: mypy datalad_registry datalad_registry_client

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