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

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

@@ Coverage Diff @@ ## master #192 +/- ## ========================================= Coverage 73.02% 73.02% Complexity 534 534 ========================================= Files 48 48 Lines 4130 4130 Branches 48 48 ========================================= Hits 3016 3016 Misses 1076 1076 Partials 38 38 

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