Update actions/checkout action to v4 #21

	name: Formatter

	on:
	pull_request: {}

	jobs:
	formatting:
	runs-on: ubuntu-latest

	steps:
	- name: git checkout
	uses: actions/checkout@v4.1.3
	with:
	ref: ${{ github.head_ref }}
	token: ${{ secrets.WALL_BREW_BOT_PAT }}

	- name: Setup Node.js
	uses: actions/setup-node@v3
	with:
	node-version: 16
	cache: 'npm'

	# Table of Contents Tool: https://github.com/thlorenz/doctoc
	- name: Install Doctoc
	run: npm install -g doctoc

	- name: Update Markdown Files
	run: doctoc README.md --github

	- name: Commit changes
	uses: stefanzweifel/git-auto-commit-action@v4.15.2
	with:
	commit_message: \|
	[Format] Auto-formatting

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