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

@@            Coverage Diff            @@
##             master     #105   +/-   ##
=========================================
  Coverage     73.81%   73.81%           
  Complexity      122      122           
=========================================
  Files            12       12           
  Lines           928      928           
  Branches         12       12           
=========================================
  Hits            685      685           
  Misses          229      229           
  Partials         14       14           

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