Bump rubocop from 1.51.0 to 1.55.1 #1717

	name: Ruby
	on: [push]
	jobs:
	build:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- name: Set up Ruby 2.7
	uses: ruby/setup-ruby@v1
	with:
	ruby-version: 2.7
	- name: Install dependencies
	run: \|
	gem install bundler
	bundle install --jobs 4 --retry 3
	- name: Check source files using `rubocop`
	run: rubocop

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