add jruby 9.3 back to test matrix #48

	---
	name: ci
	on:
	push:
	branches:
	- master
	paths:
	- ".github/workflows/ci.yml"
	- lib/**
	- "*.gemspec"
	- spec/**
	- db/migrate/**
	- Rakefile
	- Gemfile
	- ".rubocop.yml"
	pull_request:
	branches:
	- master
	create:
	jobs:
	tests:
	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	matrix:
	ruby:
	- '3.1'
	- '3.0'
	- '2.7'
	- 'jruby-9.4'
	rails:
	- "7.0.0"
	- "6.1.0"
	- "6.0.0"
	env:
	APT_DEPS: libsqlite3-dev
	RAILS_VERSION: "${{matrix.rails}}"
	RAILS_ENV: test

	steps:
	- name: Checkout
	uses: actions/checkout@v1
	- name: Install package dependencies
	run: "[ -e $APT_DEPS ] \|\| sudo apt-get install -y --no-install-recommends $APT_DEPS"
	- name: Set up Ruby
	uses: ruby/setup-ruby@v1
	with:
	ruby-version: "${{matrix.ruby}}"
	- name: Install latest bundler
	run: \|
	gem install bundler --no-document
	bundle config set without 'tools benchmarks docs'
	- name: Bundle install
	run: bundle install --jobs 4 --retry 3
	- name: Run all tests
	run: bundle exec rake app:db:reset app:spec

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