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 #171 into master will increase coverage by 0.07%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #171      +/-   ##
============================================
+ Coverage     77.37%   77.44%   +0.07%     
  Complexity     1110     1110              
============================================
  Files            73       73              
  Lines          5922     5932      +10     
  Branches        635      645      +10     
============================================
+ Hits           4582     4594      +12     
- Misses         1011     1013       +2     
+ Partials        329      325       -4     

Impacted Files	Coverage Δ	Complexity Δ
.../google/cloud/bigquery/spi/v2/HttpBigQueryRpc.java	5.20% <0.00%> (-0.04%)	2.00% <0.00%> (ø%)
...google/cloud/bigquery/StandardTableDefinition.java	93.90% <0.00%> (+0.15%)	16.00% <0.00%> (ø%)	⬆️
...n/java/com/google/cloud/bigquery/BigQueryImpl.java	67.01% <0.00%> (+0.17%)	58.00% <0.00%> (ø%)	⬆️
...src/main/java/com/google/cloud/bigquery/Field.java	82.79% <0.00%> (+0.18%)	25.00% <0.00%> (ø%)	⬆️
...m/google/cloud/bigquery/QueryJobConfiguration.java	77.14% <0.00%> (+0.28%)	56.00% <0.00%> (ø%)	⬆️
...a/com/google/cloud/bigquery/InsertAllResponse.java	89.18% <0.00%> (+0.30%)	15.00% <0.00%> (ø%)	⬆️
...om/google/cloud/bigquery/LoadJobConfiguration.java	90.15% <0.00%> (+0.47%)	52.00% <0.00%> (ø%)	⬆️
...ogle/cloud/bigquery/WriteChannelConfiguration.java	86.12% <0.00%> (+0.61%)	44.00% <0.00%> (ø%)	⬆️

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