chore: remove version for zenoh-test

[diogomatsubara]

Description

Fix release.yml workflow by setting zenoh-test as a path only dependency.

What does this PR do?

Remove version key from zenoh-test workspace definition

• zenoh-test is non-publishable and dev-dependency only.
• when the version key is defined it takes precedence over the path dependency during publication.

Why is this change needed?

This change avoids the error seen in https://github.com/eclipse-zenoh/zenoh/actions/runs/26425305854/job/77845882170

Related Issues

#2573
eclipse-zenoh/ci#451

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Labels: internal

🏠 Internal Change

This PR is marked as internal (not user-facing):

• No API changes - Public APIs unchanged
• No behavior changes - External behavior identical
• Refactoring/maintenance - Code improvements only
• Tests still pass - All existing tests pass without modification

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.02%. Comparing base (692a0c7) to head (32acc2d).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2621      +/-   ##
==========================================
- Coverage   74.07%   74.02%   -0.06%     
==========================================
  Files         400      400              
  Lines       61044    61030      -14     
==========================================
- Hits        45218    45175      -43     
- Misses      15826    15855      +29     

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