community: Update `file_path` type in `JSONLoader.__init__()` signature (#27535)
- **Description:** Change the type of the `file_path` argument from `str
| pathlib.Path` to `str | os.PathLike`, since the latter is more widely
used: https://stackoverflow.com/a/58541858
This is a very minor fix. I was just annoyed to see the red underline
displayed by Pylance in VS Code: `reportArgumentType`.

The changes do not affect the behavior of the code.