chore: Add pytest to requirements.txt

[daler91]

Added pytest to requirements.txt to include test dependencies and allow running pytest tests/ successfully.

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the project's robustness by integrating a dedicated testing framework and improving security practices for XML processing. It establishes a foundation for comprehensive unit testing across various modules, ensuring code reliability and preventing common vulnerabilities in XML parsing.

Highlights

• Dependencies: Added pytest, defusedxml, and lxml to requirements.txt to support new testing and enhanced XML parsing.
• Security Enhancement: Implemented defusedxml for XML parsing in src/xml-validator.py to mitigate potential XML vulnerabilities.
• New Test Coverage: Introduced new test files for BaseConverter, data validation functions, and XML validation exception handling.
• Improved Date Formatting Tests: Expanded test cases for the format_date utility to cover ValueError scenarios and regex fallback logic.

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[gemini-code-assist]

Code Review

This pull request adds pytest to the main requirements.txt file. It's a best practice to separate development dependencies, such as testing frameworks, from production dependencies. Including pytest in requirements.txt will cause it to be installed in production environments, which is generally not intended. I recommend moving this dependency to a separate file, for example requirements-dev.txt.

[gemini-code-assist]

Development dependencies like pytest should be kept separate from production dependencies to avoid installing them in production environments. Please consider moving this to a separate file for development/test dependencies, such as requirements-dev.txt.