Update GitHub Actions workflows to use checkout@v4 and enable caching… #1432

	name: Build and test
	on: [push, pull_request]

	jobs:
	test:
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v4

	- name: Set up Node
	uses: actions/setup-node@v2
	with:
	node-version: 18
	cache: 'yarn'

	- name: Set up Python
	uses: actions/setup-python@v2
	with:
	python-version: 3.9
	cache: 'pip'

	- name: Install project
	run: yarn

	- name: Install slither
	run: pip3 install -r scripts/requirements.txt

	- name: Show slither version
	run: slither --version

	- name: Lint
	run: yarn fullCheck

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