fix(otlp-transformer): downgrade protobufjs to version ^7.0.0

[vitorvasc]

Which problem is this PR solving?

Applies the downgrade to the protobufjs dependency on otlp-transformer package.

protobufjs-cli@^2.0.0 is not compatible with protobufjs@8.0.0, and therefore npm installs fail. That's the reason why we have not seen renovate's lockfile maintainance PRs recently.

ref protobufjs/protobuf.js#2117

Fixes #6415

Short description of the changes

• Downgrade protobufjs dependency from 8.0.0 to ^7.0.0

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• Test A

Checklist:

• Followed the style guidelines of this project
• Unit tests have been added
• Documentation has been updated

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.59%. Comparing base (e569ffd) to head (a7ce0b2).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6418   +/-   ##
=======================================
  Coverage   95.59%   95.59%           
=======================================
  Files         361      361           
  Lines       11595    11595           
  Branches     2683     2683           
=======================================
  Hits        11084    11084           
  Misses        511      511           

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[Copilot]

Pull request overview

This PR downgrades the protobufjs dependency from version 8.0.0 to ^7.0.0 to resolve npm installation failures caused by incompatibility between protobufjs-cli@^2.0.0 and protobufjs@8.0.0.

Changes:

• Downgrade protobufjs dependency specification in the otlp-transformer package
• Add changelog entry documenting the fix

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
experimental/packages/otlp-transformer/package.json	Updates protobufjs dependency version constraint from exact 8.0.0 to range ^7.0.0
experimental/CHANGELOG.md	Documents the protobufjs downgrade in the unreleased changes section

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[pichlermarc]

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