deps: update dependency com.google.api:gax-bom to v1.54.0

[renovate-bot]

This PR contains the following updates:

Package	Update	Change
com.google.api:gax-bom	minor	1.53.1 -> 1.54.0

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Release Notes

googleapis/gax-java

v1.54.0

Compare Source

02-27-2020 09:07 PST

New Features

• Scale number of threads to scale with number of cpus (#​878)
• Do not shut down executor when WatchDog is shut down (#​871)

Dependencies

• Update google-http-client to 1.34.2 (#​886)
• Update gRPC to 1.27.2 (#​885)
• Update protobuf to 3.11.4 and gRPC to 1.27.1 (#​882)

Documentation

• Add javadoc about being called within single thread (#​856)

Internal / Testing Changes

• Update jacoco to 0.8.5 (#​883)
• Update google format plugin (#​868)
• Set up linkage monitor Kokoro build config for gax-java (#​864)

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[codecov]

Codecov Report

Merging #152 into master will not change coverage by %.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #152   +/-   ##
=========================================
  Coverage     63.64%   63.64%           
  Complexity      539      539           
=========================================
  Files            30       30           
  Lines          4731     4731           
  Branches        426      426           
=========================================
  Hits           3011     3011           
  Misses         1562     1562           
  Partials        158      158           

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