Bump actions/checkout from 3 to 4 #513

	name: TwoopsTracker \| Continuous Integration
	on:
	pull_request:
	types: [opened, synchronize, reopened]
	jobs:
	build:
	name: Perform CI Checks
	runs-on: ubuntu-latest
	strategy:
	matrix:
	python-version: ["3.9"]
	steps:
	- name: Cancel Previous Runs
	uses: styfle/cancel-workflow-action@0.11.0
	with:
	access_token: ${{ github.token }}

	- name: Checkout
	uses: actions/checkout@v4
	with:
	fetch-depth: 0

	- name: Setup Python ${{ matrix.python-version }}
	uses: actions/setup-python@v4
	with:
	python-version: ${{ matrix.python-version }}

	- name: Bootstrap Pants
	run: \|
	./pants --version

	- name: Check BUILD files
	run: ./pants tailor --check update-build-files --check

	- name: Lint
	run: \|
	./pants lint --lint-skip-formatters twoops_tracker/::

	- name: Build
	run: \|
	./pants package twoops_tracker/py:twoopstracker-deps twoops_tracker/py:twoopstracker-srcs

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