Apply "instanceof pattern matching" in spring-context-indexer module

See gh-30067

spring-context-indexer/src/main/java/org/springframework/context/index/processor/CandidateComponentsIndexer.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2023 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -133,8 +133,8 @@ public class CandidateComponentsIndexer implements Processor {
 		List<TypeElement> list = new ArrayList<>();
 		for (Element element : elements) {
 			if ((element.getKind().isClass() || element.getKind() == ElementKind.INTERFACE) &&
-					element.getModifiers().contains(Modifier.STATIC) && element instanceof TypeElement) {
-				list.add((TypeElement) element);
+					element.getModifiers().contains(Modifier.STATIC) && element instanceof TypeElement te) {
+				list.add(te);
 			}
 		}
 		return list;

spring-context-indexer/src/main/java/org/springframework/context/index/processor/TypeHelper.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2023 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -73,8 +73,8 @@ class TypeHelper {
 	}
 
 	private String getQualifiedName(Element element) {
-		if (element instanceof QualifiedNameable) {
-			return ((QualifiedNameable) element).getQualifiedName().toString();
+		if (element instanceof QualifiedNameable qualifiedNameable) {
+			return qualifiedNameable.getQualifiedName().toString();
 		}
 		return element.toString();
 	}