Remove public modifier on JUnit5 lifecycle methods

See gh-17292

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/test/java/org/springframework/boot/gradle/tasks/bundling/LaunchScriptConfigurationTests.java

@@ -37,7 +37,7 @@ class LaunchScriptConfigurationTests {
 	private final Project project = mock(Project.class);
 
 	@BeforeEach
-	public void setUp() {
+	void setUp() {
 		given(this.task.getProject()).willReturn(this.project);
 	}