Clean up warnings in Jsr354NumberFormatAnnotationFormatterFactory

spring-context/src/main/java/org/springframework/format/number/money/Jsr354NumberFormatAnnotationFormatterFactory.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -53,9 +53,8 @@ public class Jsr354NumberFormatAnnotationFormatterFactory extends EmbeddedValueR
 
 
 	@Override
-	@SuppressWarnings("unchecked")
 	public Set<Class<?>> getFieldTypes() {
-		return (Set) Collections.singleton(MonetaryAmount.class);
+		return Collections.singleton(MonetaryAmount.class);
 	}
 
 	@Override