deps: update dependency com.google.protobuf:protobuf-java to v3.11.3

[renovate-bot]

This PR contains the following updates:

Package	Update	Change
com.google.protobuf:protobuf-java	patch	3.11.1 -> 3.11.3

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[codecov]

Codecov Report

Merging #60 into master will decrease coverage by 1.13%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master      #60      +/-   ##
============================================
- Coverage      66.2%   65.07%   -1.14%     
+ Complexity       72       66       -6     
============================================
  Files            12       12              
  Lines           432      418      -14     
  Branches          2        2              
============================================
- Hits            286      272      -14     
  Misses          144      144              
  Partials          2        2

Impacted Files	Coverage Δ	Complexity Δ
...cloud/texttospeech/v1beta1/TextToSpeechClient.java	55.88% <0%> (-2.46%)	9% <0%> (-2%)
...ogle/cloud/texttospeech/v1/TextToSpeechClient.java	55.88% <0%> (-2.46%)	9% <0%> (-2%)
...exttospeech/v1beta1/stub/GrpcTextToSpeechStub.java	83.33% <0%> (-0.99%)	8% <0%> (-1%)
...oud/texttospeech/v1/stub/GrpcTextToSpeechStub.java	83.33% <0%> (-0.99%)	8% <0%> (-1%)
...ospeech/v1beta1/stub/TextToSpeechStubSettings.java	78.82% <0%> (-0.49%)	11% <0%> (ø)
...texttospeech/v1/stub/TextToSpeechStubSettings.java	78.82% <0%> (-0.49%)	11% <0%> (ø)

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