Update to OpAMP Spec 0.11.0

[tigrannajaryan]

Updated opamp-spec submodule to https://github.com/open-telemetry/opamp-spec/releases/tag/v0.11.0 and regenerated the ProtoBufs.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.81%. Comparing base (41a44b9) to head (cb85261).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #337   +/-   ##
=======================================
  Coverage   77.81%   77.81%           
=======================================
  Files          25       25           
  Lines        2321     2321           
=======================================
  Hits         1806     1806           
  Misses        408      408           
  Partials      107      107           

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[tigrannajaryan]

@michel-laterman FYI, this brings the version of the spec where download_details is introduced. It would be great if you could add the corresponding implementation to OpAMP-go.