chore: update actions/checkout to version 6 in code quality workflow #104

	# This workflow uses actions that are not certified by GitHub.
	# They are provided by a third-party and are governed by
	# separate terms of service, privacy policy, and support
	# documentation.

	name: Check source code quality

	on:
	pull_request:
	branches: ["main"]

	jobs:
	code_quality:
	name: Check source code quality
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v6
	- uses: dart-lang/setup-dart@v1

	# Get dart dependencies.
	- name: Install dependencies
	run: dart pub get --no-example

	# Statically analyze the Dart code for any errors.
	- name: Analyze project source
	run: dart analyze lib bin

	# Check for any formatting issues in the code.
	- name: Verify formatting
	run: dart format --set-exit-if-changed lib bin

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