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 increase coverage by 1.38%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master      #60      +/-   ##
============================================
+ Coverage     69.45%   70.84%   +1.38%     
+ Complexity       64       55       -9     
============================================
  Files             6        6              
  Lines           442      415      -27     
  Branches          7        7              
============================================
- Hits            307      294      -13     
+ Misses          124      118       -6     
+ Partials         11        3       -8

Impacted Files	Coverage Δ	Complexity Δ
.../cloud/oslogin/v1/stub/GrpcOsLoginServiceStub.java	93.38% <0%> (-0.5%)	12% <0%> (-1%)
...ud/oslogin/v1/stub/OsLoginServiceStubSettings.java	82.25% <0%> (-0.29%)	15% <0%> (ø)
.../google/cloud/oslogin/v1/OsLoginServiceClient.java	54.45% <0%> (+6.62%)	23% <0%> (-8%)	⬇️

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