[Code Issue] Predicate.not()による否定

### Category

streams

### Pattern slug

predicate-not

### Which code is affected?

Modern code example

### Type of issue

Code doesn't compile

### Describe the issue

toList() is available in Java 16 and later.
It is not available in Java 11.

### Suggested fix

```java

```

### JDK version tested

_No response_