pyproject: Pin OpenTelemetry versions

[ronensc]

Description

This PR pins the major and minor versions of the OpenTelemetry packages to avoid potential issues with version mismatches.
This is a follow-up to vllm-project/vllm#7266

How Has This Been Tested?

I build the project python -m build && pip install dist/*whl and manually verified that the OTel package versions fall within the pinned range by running pip list | grep opentelemetry

Merge criteria:

• The commits are squashed in a cohesive manner and have meaningful messages.
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.98%. Comparing base (4a053ff) to head (ab22f4b).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #106   +/-   ##
=======================================
  Coverage   55.98%   55.98%           
=======================================
  Files          24       24           
  Lines        1486     1486           
  Branches      268      268           
=======================================
  Hits          832      832           
  Misses        579      579           
  Partials       75       75           

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[njhill]

Thanks @ronensc!