Update actions/checkout action to v4 #95

	---
	name: CI
	on: [ push, pull_request ]
	jobs:
	tests:
	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	matrix:
	ruby: [ '2.6', '2.7', '3.0', '3.1', '3.2', '3.3' ]
	rails: [ '5-2', '6-0', '6-1', '7-0', '7-1' ]
	# excludes are sorted by Ruby version, then Rails version
	exclude:
	- ruby: 2.6 # Rails 7 requires 2.7 minimum
	rails: 7-0
	- ruby: 2.6 # Rails 7.1 requires 2.7 minimum
	rails: 7-1
	- ruby: 3.0 # Ruby 3 support for 5.2 hasn't been added
	rails: 5-2
	- ruby: 3.1 # Ruby 3.1 only works on the latest Rails 7 version
	rails: 5-2
	- ruby: 3.1
	rails: 6-0
	- ruby: 3.1
	rails: 6-1
	- ruby: 3.2 # Ruby 3.2 only works on the latest Rails 7 version
	rails: 5-2
	- ruby: 3.2
	rails: 6-0
	- ruby: 3.2
	rails: 6-1
	- ruby: 3.3 # Ruby 3.3 only works on the latest Rails 7 version
	rails: 5-2
	- ruby: 3.3
	rails: 6-0
	- ruby: 3.3
	rails: 6-1

	steps:
	- uses: actions/checkout@v4

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

	- name: Bundle for Appraisal
	run: bundle

	- name: Install Appraisal dependencies
	run: bundle exec appraisal rails-${{ matrix.rails }} bundle

	- name: Run tests
	run: bundle exec appraisal rails-${{ matrix.rails }} bundle exec rspec

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