Bump rubocop from 1.50.2 to 1.53.0 #292

	name: Linting
	on:
	- pull_request
	jobs:
	yamllint:
	name: Yamllint
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- name: Yamllint
	uses: karancode/yamllint-github-action@master
	with:
	yamllint_comment: true
	env:
	GITHUB_ACCESS_TOKEN: ${{ secrets.GITHUB_TOKEN }}
	markdownlint:
	name: markdownlint
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- uses: actions/setup-node@v1
	with:
	node-version: '16'
	- name: Check markdown files using `markdownlint`
	run: \|
	npm install -g markdownlint-cli
	markdownlint *.md
	hadolint:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- name: Lint Dockerfile
	uses: hadolint/hadolint-action@master
	with:
	dockerfile: "Dockerfile"

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