chore: Add missing direct dependency on Pydantic

[vdusek]

• Using the same version constraints as in Crawlee, since there is no reason to be more strict.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.98%. Comparing base (675eaf7) to head (3a48d62).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #744   +/-   ##
=======================================
  Coverage   81.98%   81.98%           
=======================================
  Files          46       46           
  Lines        2681     2681           
=======================================
  Hits         2198     2198           
  Misses        483      483           

Flag	Coverage Δ
integration	56.13% <ø> (ø)
unit	67.92% <ø> (ø)

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