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Starting in JDK 13, calls to `FileSystem.newFileSystem(path, null)` are
ambiguous.
The calls match both:
* [`FileSystem.newFileSystem(Path, ClassLoader)`](https://docs.oracle.com/en/java/javase/13/docs/api/java.base/java/nio/file/FileSystems.html#newFileSystem\(java.nio.file.Path,java.lang.ClassLoader\))
* [`FileSystem.newFileSystem(Path, Map<?, ?>)`](https://docs.oracle.com/en/java/javase/13/docs/api/java.base/java/nio/file/FileSystems.html#newFileSystem\(java.nio.file.Path,java.util.Map\))
To disambiguate, add a cast to the desired type, to preserve the pre-JDK 13
behaviour.
That is, prefer this:
```java
FileSystem.newFileSystem(path, (ClassLoader) null);
```
Instead of this:
```java
FileSystem.newFileSystem(path, null);
```
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