build(deps): Remove unused hypothesis-jsonschema test dependency

[Enimalojd]

hypothesis-jsonschema is never imported anywhere in the project: HAR validation in tests uses jsonschema.Draft7Validator directly, and data generation relies on st.from_type() over plain dataclasses. The package is only needed for st.from_schema(), which is not used here.

[codspeed]

Merging this PR will not alter performance

✅ 1 untouched benchmark

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_{Comparing Enimalojd:drop_hypothesis_jsonschema (da7f974) with main (36098ca)}

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.87%. Comparing base (36098ca) to head (da7f974).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #115   +/-   ##
=======================================
  Coverage   97.87%   97.87%           
=======================================
  Files           3        3           
  Lines         283      283           
  Branches       58       58           
=======================================
  Hits          277      277           
  Misses          4        4           
  Partials        2        2           

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