deps: update dependency com.google.protobuf:protobuf-java-util to v3.12.2

[renovate-bot]

This PR contains the following updates:

Package	Update	Change
com.google.protobuf:protobuf-java-util	minor	3.11.4 -> 3.12.2

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[codecov]

Codecov Report

Merging #155 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #155   +/-   ##
=========================================
  Coverage     69.45%   69.45%           
  Complexity       64       64           
=========================================
  Files             6        6           
  Lines           442      442           
  Branches          7        7           
=========================================
  Hits            307      307           
  Misses          124      124           
  Partials         11       11           

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