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

@@            Coverage Diff            @@
##             master     #165   +/-   ##
=========================================
  Coverage     71.07%   71.07%           
  Complexity      366      366           
=========================================
  Files            42       42           
  Lines          2821     2821           
  Branches         38       38           
=========================================
  Hits           2005     2005           
  Misses          768      768           
  Partials         48       48           

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