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

@@            Coverage Diff            @@
##             master     #192   +/-   ##
=========================================
  Coverage     73.02%   73.02%           
  Complexity      534      534           
=========================================
  Files            48       48           
  Lines          4130     4130           
  Branches         48       48           
=========================================
  Hits           3016     3016           
  Misses         1076     1076           
  Partials         38       38           

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