Polish "Use String.repeat instead of explicit cycle"

See gh-31802

spring-webmvc/src/main/java/org/springframework/web/servlet/function/ToStringVisitor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 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.
@@ -80,7 +80,7 @@ class ToStringVisitor implements RouterFunctions.Visitor, RequestPredicates.Visi
 	}
 
 	private void indent() {
-        this.builder.append(" ".repeat(Math.max(0, this.indent)));
+		this.builder.append(" ".repeat(Math.max(0, this.indent)));
 	}