Remove the typing_extensions dependency

[AdeelH]

Overview

This PR removes the typing_extensions dependency since it is no longer needed.

It was only used for the Literal type, but its Literal type is identical to typing.Literal for newer versions of Python.

Checklist

• Added unit tests, if applicable
• Updated documentation, if applicable
• Added needs-backport label if the change should be back-ported to the previous release
• PR has a name that won't get you publicly shamed for vagueness

Notes

N/A

Testing Instructions

N/A

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d173194) 86.20% compared to head (0054b3d) 86.19%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1992      +/-   ##
==========================================
- Coverage   86.20%   86.19%   -0.01%     
==========================================
  Files         195      195              
  Lines        9627     9621       -6     
==========================================
- Hits         8299     8293       -6     
  Misses       1328     1328              

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