Fix extension check for IncludedShotlistSetting

[gtrevisan]

IncludedShotlistSetting might return a PosixPath, not a str.

$ uv run disruption-py cmod_ufo

[snip]
     if self.file_path.endswith(".parquet"):
       ^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'PosixPath' object has no attribute 'endswith'

[Copilot]

Pull request overview

Fixes a crash in IncludedShotlistSetting/FileShotlistSetting when file_path is a pathlib.Path (e.g., from importlib.resources.as_file) by making the .parquet extension check work for non-str path types.

Changes:

• Normalize self.file_path to a string for the .parquet extension check to avoid calling endswith on a Path.

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