Pin opentelemetry-proto version

[cheng-tan]

Description

This PR pins opentelemetry-proto version to >=1.28.0, which uses protobuf > 5.0, < 6.0 to generate protobuf files.

Related issue number

Closes #6304

[ekzhu]

You will need to run uv sync --all-extras in the python directory to update the uv.lock file.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.24%. Comparing base (7e8472f) to head (3b2f05d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6305   +/-   ##
=======================================
  Coverage   77.24%   77.24%           
=======================================
  Files         200      200           
  Lines       14473    14473           
=======================================
  Hits        11180    11180           
  Misses       3293     3293           

Flag	Coverage Δ
unittests	77.24% <ø> (ø)

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