MustBeClosedChecker Mockito matcher is missing some cases that should be suppressed

Assuming that we have the following code:
```
class SomeClass {
@MustBeClosed
Closeable someMethod() {
return new AutoCloseable() {
public void close() {};
};
}
}
```

Two examples of code that are still being flagged by the checker are:
```
SomeClass instance = new SomeClass();
Mockito.lenient().when(instance).someMethod();
```

```
SomeClass instance = new SomeClass();
Mockito.verify(instance).someMethod();
```