Security Advisory: Sanitize author and filename path components

Security Improvement

A security improvement has been submitted via PR #484: https://github.com/JoeanAmier/XHS-Downloader/pull/484

Summary: Sanitize author and filename path components

This PR was generated by an automated security scan and has passed focused tests. Please review the PR for details and merge at your discretion.

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Submitted by: @failsafesecurity (FailSafe Security Research)