fix: Bump typing-extensions floor to 4.4.0

[vdusek]

The codebase imports override from typing_extensions in ten modules (and Unpack in events/_apify_event_manager.py), but override was only added in typing_extensions 4.4.0. With the previous >=4.1.0 floor, a minimal dependency resolution fails at import time. This bumps the floor to >=4.4.0, the accurate minimum for the features actually used.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.04%. Comparing base (a87e8d1) to head (4ed1db8).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #960      +/-   ##
==========================================
+ Coverage   90.00%   90.04%   +0.03%     
==========================================
  Files          49       49              
  Lines        3053     3053              
==========================================
+ Hits         2748     2749       +1     
+ Misses        305      304       -1     

Flag	Coverage Δ
e2e	35.66% <ø> (ø)
integration	56.89% <ø> (+0.03%)	⬆️
unit	78.70% <ø> (ø)

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