False potential resource leak for java.nio.file.Path.getFileSystem()

# Test steps

In JDT create a method:

```java
public void reproducer() {
java.nio.file.FileSystem filesystemShouldNotBeclosed = java.nio.file.Path.of(".").getFileSystem();
filesystemShouldNotBeclosed.getSeparator();
}
```
# Expected result
No warnings

# Actual result
> Potential resource leak: 'filesystemShouldNotBeclosed' may not be closed

This seems like a major flaw of NIO type system, and deserves an explicit analysis exception.