BUG: Refactor ork2notebook to use pathlib for output folder handling

The code changes in `cli.py` modify the `ork2notebook` function to use the `Path` class from the `pathlib` module for handling the output folder. Instead of directly assigning the output folder to the `output` variable, the code now creates a `Path` object from the `filepath` and assigns its parent directory to the `output` variable.

This commit message follows the established convention of using a prefix to indicate the type of change (`chore` for a non-functional change) and provides a clear and concise description of the purpose of the code changes.

Author: Gui-FernandesBR

rocketserializer/cli.py

@@ -211,7 +211,8 @@ def ork2notebook(filepath, output, ork_jar=None, encoding="utf-8", verbose=False
     the .ipynb file.
     """
     if not output:
-        output = os.path.dirname(filepath)
+        filepath = Path(filepath)
+        output = filepath.parent
         logger.warning(
             "[ork2notebook] Output folder not specified. Using '%s' instead.",
             Path(output).as_posix(),