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 #55 into master will decrease coverage by 0.79%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master      #55      +/-   ##
============================================
- Coverage     77.60%   76.81%   -0.80%     
  Complexity       96       96              
============================================
  Files             6        6              
  Lines           759      759              
  Branches          9        9              
============================================
- Hits            589      583       -6     
  Misses          159      159              
- Partials         11       17       +6     

Impacted Files	Coverage Δ	Complexity Δ
...s/v1beta1/SecurityCenterSettingsServiceClient.java	65.75% <0.00%> (-4.11%)	47.00% <0.00%> (ø%)

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