Reduce warnings reported by Eclipse

Closes gh-43269

spring-boot-project/spring-boot-tools/spring-boot-test-support/src/main/java/org/springframework/boot/testsupport/classpath/ModifiedClassPathClassLoader.java

@@ -99,6 +99,7 @@ final class ModifiedClassPathClassLoader extends URLClassLoader {
 		return super.loadClass(name);
 	}
 
+	@SuppressWarnings("resource")
 	static ModifiedClassPathClassLoader get(Class<?> testClass, Method testMethod, List<Object> arguments) {
 		Set<AnnotatedElement> candidates = new LinkedHashSet<>();
 		candidates.add(testClass);