deps: update dependency com.google.protobuf:protobuf-java to v3.11.4

[renovate-bot]

This PR contains the following updates:

Package	Update	Change
com.google.protobuf:protobuf-java	patch	3.11.3 -> 3.11.4

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[codecov]

Codecov Report

Merging #58 into master will increase coverage by 0.58%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master      #58      +/-   ##
============================================
+ Coverage     75.65%   76.23%   +0.58%     
+ Complexity      108       93      -15     
============================================
  Files             7        7              
  Lines           920      867      -53     
  Branches         15       15              
============================================
- Hits            696      661      -35     
+ Misses          204      198       -6     
+ Partials         20        8      -12

Impacted Files	Coverage Δ	Complexity Δ
...atransfer/v1/stub/GrpcDataTransferServiceStub.java	95.81% <0%> (-0.34%)	20% <0%> (-1%)
...nsfer/v1/stub/DataTransferServiceStubSettings.java	80.46% <0%> (-0.23%)	23% <0%> (-1%)
...ery/datatransfer/v1/DataTransferServiceClient.java	71.21% <0%> (+4.99%)	44% <0%> (-13%)	⬇️

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