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	patch	3.12.0 -> 3.12.2

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[codecov]

Codecov Report

Merging #168 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #168   +/-   ##
=========================================
  Coverage     73.90%   73.90%           
  Complexity      422      422           
=========================================
  Files            36       36           
  Lines          3384     3384           
  Branches         47       47           
=========================================
  Hits           2501     2501           
  Misses          822      822           
  Partials         61       61           

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