Drop grpc 3.7 testing version

[TimPansino]

Overview

• Older version of grpc for Python 3.7 testing is conflicting with latest grpc versions when installed, so drop it in favor of just testing supported versions of Python on the latest grpc version.

[github-actions[bot]]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 81.31%. Comparing base (7d6da2c) to head (cab276d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1244      +/-   ##
==========================================
- Coverage   81.34%   81.31%   -0.04%     
==========================================
  Files         198      198              
  Lines       21682    21682              
  Branches     3431     3431              
==========================================
- Hits        17638    17630       -8     
- Misses       2917     2920       +3     
- Partials     1127     1132       +5     

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