deps: update dependency com.google.protobuf:protobuf-java to v3.12.0

[renovate-bot]

This PR contains the following updates:

Package	Update	Change
com.google.protobuf:protobuf-java	minor	3.11.4 -> 3.12.0

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[codecov]

Codecov Report

Merging #141 into master will increase coverage by 0.60%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #141      +/-   ##
============================================
+ Coverage     65.24%   65.85%   +0.60%     
- Complexity      100      108       +8     
============================================
  Files            18       18              
  Lines           751      779      +28     
  Branches          5       11       +6     
============================================
+ Hits            490      513      +23     
- Misses          251      256       +5     
  Partials         10       10              

Impacted Files	Coverage Δ	Complexity Δ
...rrorreporting/v1beta1/ErrorStatsServiceClient.java	63.44% <0.00%> (-0.09%)	15.00% <0.00%> (+3.00%)	⬇️
...rrorreporting/v1beta1/ErrorGroupServiceClient.java	42.50% <0.00%> (+0.39%)	10.00% <0.00%> (+1.00%)
...ng/v1beta1/stub/ErrorGroupServiceStubSettings.java	79.31% <0.00%> (+0.48%)	11.00% <0.00%> (ø%)
...orreporting/v1beta1/ReportErrorsServiceClient.java	42.42% <0.00%> (+0.48%)	7.00% <0.00%> (+1.00%)
...ting/v1beta1/stub/GrpcReportErrorsServiceStub.java	78.57% <0.00%> (+0.52%)	7.00% <0.00%> (ø%)
...ng/v1beta1/stub/ErrorStatsServiceStubSettings.java	77.16% <0.00%> (+0.55%)	13.00% <0.00%> (+1.00%)
.../v1beta1/stub/ReportErrorsServiceStubSettings.java	78.20% <0.00%> (+0.57%)	10.00% <0.00%> (ø%)
...orting/v1beta1/stub/GrpcErrorStatsServiceStub.java	87.91% <0.00%> (+0.70%)	10.00% <0.00%> (+1.00%)
...orting/v1beta1/stub/GrpcErrorGroupServiceStub.java	85.00% <0.00%> (+0.78%)	9.00% <0.00%> (+1.00%)

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