Remove spacy dependancy in pyproject.toml

[ptgolden]

Copied from #913 from @madanucd

Related issues

• Closes Spacy git dependency breaks pypi deploy #809

Summary

This PR addresses dependency issues with monarch-py deployment to PyPI, fixing errors caused by direct dependencies on external URLs for spacy en_core_sci_sm model.

• Utilized pystow to download and cache the en_core_sci_sm model from an S3 URL.

• Implemented automatic unpacking and dynamic directory identification to ensure the model is properly extracted and loaded.

Checks

• All annotation backend tests were checked and successfully passed.
• Completed testing of the API development environment to ensure proper integration.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.26%. Comparing base (af5ab7b) to head (5193daf).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #920      +/-   ##
==========================================
+ Coverage   71.14%   71.26%   +0.11%     
==========================================
  Files          91       91              
  Lines        3136     3149      +13     
==========================================
+ Hits         2231     2244      +13     
  Misses        905      905              

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