Update actions/checkout action to v4 #109

	---
	name: Code Analysis
	on: # yamllint disable-line rule:truthy
	# Trigger the workflow on pushes to the default branch and all pull requests.
	push:
	branches:
	- main
	pull_request:

	jobs:
	markdownlint:
	runs-on: ubuntu-latest
	steps:
	- name: Lint markdown files
	uses: avto-dev/markdown-lint@v1
	with:
	args: 'README.md .github/'

	yaml-lint:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4

	- name: YAML lint
	uses: ibiqlik/action-yamllint@master
	with:
	config_file: .yamllint.yml

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