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

[renovate-bot]

This PR contains the following updates:

Package	Update	Change
com.google.protobuf:protobuf-bom (source)	patch	3.11.1 -> 3.11.3

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Release Notes

protocolbuffers/protobuf

v3.11.3

Compare Source

C++

• Add OUT and OPTIONAL to windows portability files (#​7087)

PHP

• Refactored ulong to zend_ulong for php7.4 compatibility (#​7147)
• Call register_class before getClass from desc to fix segfault (#​7077)

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[codecov]

Codecov Report

Merging #148 into master will increase coverage by 0.19%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #148      +/-   ##
============================================
+ Coverage     66.48%   66.68%   +0.19%     
+ Complexity      370      365       -5     
============================================
  Files            34       34              
  Lines          1877     1870       -7     
  Branches        240      237       -3     
============================================
- Hits           1248     1247       -1     
+ Misses          527      521       -6     
  Partials        102      102

Impacted Files	Coverage Δ	Complexity Δ
.../com/google/cloud/MonitoredResourceDescriptor.java	83.76% <0%> (-0.28%)	20% <0%> (-4%)
...a/com/google/cloud/testing/BaseEmulatorHelper.java	31.21% <0%> (-0.22%)	5% <0%> (ø)
...src/main/java/com/google/cloud/ServiceOptions.java	44.22% <0%> (-0.05%)	32% <0%> (-1%)
...re/src/main/java/com/google/cloud/RetryHelper.java	53.84% <0%> (+3.84%)	2% <0%> (ø)	⬇️
.../java/com/google/cloud/testing/CommandWrapper.java	96.96% <0%> (+9.09%)	13% <0%> (ø)	⬇️

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