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

@@            Coverage Diff            @@
##             master     #136   +/-   ##
=========================================
  Coverage     76.83%   76.83%           
  Complexity      212      212           
=========================================
  Files            18       18           
  Lines          1878     1878           
  Branches          6        6           
=========================================
  Hits           1443     1443           
  Misses          429      429           
  Partials          6        6           

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