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

@@            Coverage Diff            @@
##             master     #152   +/-   ##
=========================================
  Coverage     72.43%   72.43%           
  Complexity      219      219           
=========================================
  Files            19       19           
  Lines          1669     1669           
  Branches         26       26           
=========================================
  Hits           1209     1209           
  Misses          427      427           
  Partials         33       33           

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