bump otlp protos to 0.20.0

[tsloughter]

No description provided.

[codecov]

Codecov Report

Patch coverage: 30.00% and project coverage change: +34.09 🎉

Comparison is base (015cdcb) 38.25% compared to head (baccb2e) 72.34%.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #598       +/-   ##
===========================================
+ Coverage   38.25%   72.34%   +34.09%     
===========================================
  Files          61       60        -1     
  Lines        3597     1902     -1695     
===========================================
  Hits         1376     1376               
+ Misses       2221      526     -1695     

Flag	Coverage Δ
api	68.16% <ø> (ø)
elixir	18.31% <ø> (ø)
erlang	73.66% <30.00%> (+35.42%)	⬆️
exporter	66.80% <30.00%> (+58.48%)	⬆️
sdk	78.22% <ø> (ø)
zipkin	54.16% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ntelemetry_exporter/src/opentelemetry_exporter.erl	63.69% <30.00%> (-1.16%)	⬇️

... and 1 file with indirect coverage changes

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