chore: publish otel-proto v1.5.0

[lalitb]

also fixes: #2410

Changes

Update otel-proto v1.5.0:
https://github.com/open-telemetry/opentelemetry-proto/releases/tag/v1.5.0

This brings LogRecord::event_name, so update the code to populate this.

Merge requirement checklist

• CONTRIBUTING guidelines followed
• Unit tests added/updated (if applicable)
• Appropriate CHANGELOG.md files updated for non-trivial, user-facing changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.8%. Comparing base (6a3b04d) to head (8c35582).
Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #2439   +/-   ##
=====================================
  Coverage   76.8%   76.8%           
=====================================
  Files        122     122           
  Lines      21805   21806    +1     
=====================================
+ Hits       16757   16758    +1     
  Misses      5048    5048           

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[cijothomas]

Lets also add a changelog in OTLP Exporter to indicate it'll now export event name