Update actions/checkout action to v4 #280

	name: CI

	on:
	push:
	branches: [ main ]
	pull_request:
	branches: [ main ]

	jobs:
	build:
	name: "Build & Test"
	runs-on: ubuntu-latest

	strategy:
	matrix:
	ruby: [2.5, 2.7, 3.0]

	steps:
	- name: Checkout source code
	uses: actions/checkout@v4
	with:
	fetch-depth: 0 # for bin/rubocop_changes

	- name: Set up Ruby
	uses: ruby/setup-ruby@v1
	with:
	ruby-version: ${{ matrix.ruby }}

	- name: Recreate Ruby Bundler cache
	uses: actions/cache@v3
	with:
	path: vendor/bundle
	key: ${{ runner.os }}-bundler-${{ hashFiles('*/Gemfile') }}
	restore-keys: \|
	${{ runner.os }}-bundler-

	- name: Install dependencies
	run: bundle install --path ./vendor/bundle

	- name: Run tests
	run: bundle exec rspec

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