deps: update dependency com.google.protobuf:protobuf-java to v3.12.2

[renovate-bot]

This PR contains the following updates:

Package	Update	Change
com.google.protobuf:protobuf-java	minor	3.11.4 -> 3.12.2

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[codecov]

Codecov Report

Merging #176 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #176   +/-   ##
=========================================
  Coverage     69.89%   69.89%           
  Complexity       88       88           
=========================================
  Files            12       12           
  Lines           558      558           
  Branches          2        2           
=========================================
  Hits            390      390           
  Misses          166      166           
  Partials          2        2           

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