Exclude starter POMs from lib-provided when using Gradle

Fixes gh-48195

Author: philwebb

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/main/java/org/springframework/boot/gradle/plugin/WarPluginAction.java

@@ -86,14 +86,16 @@ private TaskProvider<BootWar> configureBootWarTask(Project project) {
 			.minus((developmentOnly.minus(productionRuntimeClasspath)))
 			.minus((testAndDevelopmentOnly.minus(productionRuntimeClasspath)))
 			.filter(new JarTypeFileSpec());
+		Callable<FileCollection> providedClasspath = () -> providedRuntimeConfiguration(project)
+			.filter(new JarTypeFileSpec());
 		TaskProvider<ResolveMainClassName> resolveMainClassName = project.getTasks()
 			.named(SpringBootPlugin.RESOLVE_MAIN_CLASS_NAME_TASK_NAME, ResolveMainClassName.class);
 		TaskProvider<BootWar> bootWarProvider = project.getTasks()
 			.register(SpringBootPlugin.BOOT_WAR_TASK_NAME, BootWar.class, (bootWar) -> {
 				bootWar.setGroup(BasePlugin.BUILD_GROUP);
 				bootWar.setDescription("Assembles an executable war archive containing webapp"
 						+ " content, and the main classes and their dependencies.");
-				bootWar.providedClasspath(providedRuntimeConfiguration(project));
+				bootWar.providedClasspath(providedClasspath);
 				bootWar.setClasspath(classpath);
 				Provider<String> manifestStartClass = project
 					.provider(() -> (String) bootWar.getManifest().getAttributes().get("Start-Class"));