Refactor from deprecated getAliasedStringArray

Update EntityScanPackages to make use of Spring Framework's updated
alias support with ASM reading.

Closes gh-6337

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/domain/EntityScanPackages.java

@@ -155,8 +155,7 @@ public class EntityScanPackages {
 		private Set<String> getPackagesToScan(AnnotationMetadata metadata) {
 			AnnotationAttributes attributes = AnnotationAttributes.fromMap(
 					metadata.getAnnotationAttributes(EntityScan.class.getName()));
-			String[] basePackages = attributes.getAliasedStringArray("basePackages",
-					EntityScan.class, metadata.getClassName());
+			String[] basePackages = attributes.getStringArray("basePackages");
 			Class<?>[] basePackageClasses = attributes
 					.getClassArray("basePackageClasses");
 			Set<String> packagesToScan = new LinkedHashSet<String>();