allow typing-extensions-4.7.0+ on pypy3.9+

[mgorny]

Change Summary

Remove the PyPy-specific version restriction on typing-extensions when PyPy3.9 or newer is used. The bug cited
in 12073b8 is specific to PyPy3.7 and PyPy3.8.

Related issue number

(discussed in 12073b8#r120315009)

Checklist

• Unit tests for the changes exist
• Documentation reflects the changes where applicable
• Pydantic tests pass with this pydantic-core (except for expected changes)
• My PR is ready to review, please add a comment including the phrase "please review" to assign reviewers

Selected Reviewer: @davidhewitt

[mgorny]

please review

[codecov]

Codecov Report

Merging #723 (decff72) into main (7da65c4) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #723   +/-   ##
=======================================
  Coverage   93.63%   93.63%           
=======================================
  Files          99       99           
  Lines       13911    13911           
  Branches       25       25           
=======================================
  Hits        13026    13026           
  Misses        879      879           
  Partials        6        6           

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[codspeed-hq]

CodSpeed Performance Report

Merging #723 will not alter performances

_{Comparing mgorny:typing-ext-pypy39 (decff72) with main (7da65c4)}

Summary

✅ 125 untouched benchmarks

[mgorny]

Thanks!