Fix TypeReference#getName for CGLIB proxies

This commit makes sure that the double '$' sign typically used by
generated cglib proxies are not used as an inner class separator.

Closes gh-29252

spring-core/src/main/java/org/springframework/aot/hint/SimpleTypeReference.java

@@ -49,7 +49,7 @@ final class SimpleTypeReference extends AbstractTypeReference {
 		if (!className.contains("$")) {
 			return createTypeReference(className);
 		}
-		String[] elements = className.split("\\$");
+		String[] elements = className.split("(?<!\\$)\\$(?!\\$)");
 		SimpleTypeReference typeReference = createTypeReference(elements[0]);
 		for (int i = 1; i < elements.length; i++) {
 			typeReference = new SimpleTypeReference(typeReference.getPackageName(), elements[i], typeReference);