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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