added protobuf version as exporter user-agent version

[bryce-b]

No description provided.

[codecov]

Codecov Report

Patch coverage: 87.50% and project coverage change: -0.03% ⚠️

Comparison is base (27e3fec) 66.37% compared to head (762022b) 66.35%.

❗ Current head 762022b differs from pull request most recent head bb17394. Consider uploading reports for the commit bb17394 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #444      +/-   ##
==========================================
- Coverage   66.37%   66.35%   -0.03%     
==========================================
  Files         331      331              
  Lines       14113    14113              
==========================================
- Hits         9368     9365       -3     
- Misses       4745     4748       +3     

Files Changed	Coverage Δ
...s/OpenTelemetryProtocolCommon/common/Headers.swift	88.88% <87.50%> (-11.12%)	⬇️

... and 2 files with indirect coverage changes

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[vvydier]

Do we have to update this with every release? or is there a way to pick it up from the release meta data?

[bryce-b]

@vvydier only when we update the protobufs. which reminds me: I should update the docs to note this.

[bryce-b]

@nachoBonafonte I don't have merge permissions, could you merge this?