[bot][dev]: Bump actions/checkout from 3 to 4 #4

	# Tests PRs on Gradle for the quickstarts that support it.

	name: OptaPlanner Gradle CI

	on:
	push:
	branches:
	- development
	paths-ignore:
	- 'LICENSE*'
	- '.gitignore'
	- '.gitattributes'
	- '**.md'
	- '**.adoc'
	- '*.txt'
	- 'build/**'
	- '.ci/**'
	pull_request:
	types: [opened, synchronize, reopened, ready_for_review]
	branches:
	- development
	paths-ignore:
	- 'LICENSE*'
	- '.gitignore'
	- '.gitattributes'
	- '**.md'
	- '**.adoc'
	- '*.txt'
	- 'build/**'
	- '.ci/**'

	defaults:
	run:
	shell: bash

	jobs:
	quickstarts:
	name: Matrix
	runs-on: ubuntu-latest
	strategy:
	matrix:
	quickstartDir: ['hello-world', 'use-cases/school-timetabling', 'technology/java-spring-boot']
	java-version: [17] # JDK 19 not yet supported by Gradle.
	steps:
	- uses: actions/checkout@v4
	- name: Set up JDK
	uses: actions/setup-java@v3
	with:
	distribution: 'temurin'
	java-version: ${{ matrix.java-version }}
	check-latest: true
	- name: Cache Gradle packages
	uses: actions/cache@v3
	with:
	path: \|
	~/.gradle/caches
	~/.gradle/wrapper
	key: ${{ runner.os }}-gradle-${{ hashFiles('*/.gradle', '*/gradle-wrapper.properties') }}
	restore-keys: \|
	${{ runner.os }}-gradle-
	- name: Build with Gradle
	run: cd ${{ matrix.quickstartDir }} && gradle build
	- name: Cleanup Gradle Cache
	# Remove some files from the Gradle cache, so they aren't cached by GitHub Actions.
	# Restoring these files from a GitHub Actions cache might cause problems for future builds.
	run: \|
	rm -f ~/.gradle/caches/modules-2/modules-2.lock
	rm -f ~/.gradle/caches/modules-2/gc.properties

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