Bump grpcio to 1.44 to be compatible with protobuf 5

[thodkatz]

protobuf 5 requires protoc version >= 3.19.0 that requires grpcio >= 1.44

.proto files have been generated with the updates grpcio=1.44

Fixes #219

[codecov]

Codecov Report

Attention: Patch coverage is 36.53846% with 66 lines in your changes missing coverage. Please review.

Project coverage is 65.50%. Comparing base (7dc4196) to head (e91bd2c).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
tiktorch/proto/inference_pb2.py	35.36%	53 Missing ⚠️
tiktorch/proto/data_store_pb2.py	40.90%	13 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #220      +/-   ##
==========================================
- Coverage   68.45%   65.50%   -2.96%     
==========================================
  Files          40       40              
  Lines        2270     2267       -3     
==========================================
- Hits         1554     1485      -69     
- Misses        716      782      +66     

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