Use toUnmodifiableSet and toList instead of collectingAndThen

Since Spring Framework 6 uses JDK 17 for its baseline, we can make use
of toList() and toUnmodifiableSet() which were introduced in JDK 16 and
JDK 10, respectively.

Closes gh-27618

spring-beans/src/main/java/org/springframework/beans/factory/config/YamlProcessor.java

@@ -146,7 +146,7 @@ public abstract class YamlProcessor {
 		else {
 			Assert.noNullElements(supportedTypes, "'supportedTypes' must not contain null elements");
 			this.supportedTypes = Arrays.stream(supportedTypes).map(Class::getName)
-					.collect(Collectors.collectingAndThen(Collectors.toSet(), Collections::unmodifiableSet));
+					.collect(Collectors.toUnmodifiableSet());
 		}
 	}