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 Report

Merging #177 into master will not change coverage.
The diff coverage is n/a.

@@ Coverage Diff @@ ## master #177 +/- ## ========================================= Coverage 71.56% 71.56% Complexity 132 132 ========================================= Files 12 12 Lines 1020 1020 Branches 18 18 ========================================= Hits 730 730 Misses 270 270 Partials 20 20 

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