[chore]: Re-bump opentelemetry to v1.20.0

[joelanford]

This was bumped originally in #309, but we accidentally reverted it in #292. Just putting the opentelemetry (and related) versions back to where we expect them to be.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9ffba44) 42.64% compared to head (e1d795c) 42.64%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #310   +/-   ##
=======================================
  Coverage   42.64%   42.64%           
=======================================
  Files          42       42           
  Lines        3583     3583           
=======================================
  Hits         1528     1528           
  Misses       1903     1903           
  Partials      152      152           

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[grokspawn]

/lgtm

[acornett21]

@joelanford I don't feel like this is the best way to manage this. If this project is manually updating indirect dependencies, contributors aren't going to know that, and the same mistake will happen again. Should a required sections be added for these indirects which have been changed manually?