Bump the `actions/checkout` action to `v4`. #18

	name: CI

	on: [push, pull_request]

	jobs:
	tests:
	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	matrix:
	ruby:
	- "3.0"
	- "3.1"
	# - jruby
	# - truffleruby
	name: Ruby ${{ matrix.ruby }}
	steps:
	- uses: actions/checkout@v4
	- name: Setup Chrome
	uses: browser-actions/setup-chrome@latest
	with:
	chrome-version: stable
	- name: Set up Ruby
	uses: ruby/setup-ruby@v1
	with:
	ruby-version: ${{ matrix.ruby }}
	bundler-cache: true
	# - name: Install dependencies
	# run: \|
	# sudo apt update -y && \
	# sudo apt install -y --no-install-recommends --no-install-suggests FIXME
	- name: Install dependencies
	run: bundle install --jobs 4 --retry 3
	- name: Run tests
	run: bundle exec rake test

	# rubocop linting
	rubocop:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- name: Set up Ruby
	uses: ruby/setup-ruby@v1
	with:
	ruby-version: 3.0
	- name: Install dependencies
	run: bundle install --jobs 4 --retry 3
	- name: Run rubocop
	run: bundle exec rubocop --parallel

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