Release gax-java v1.54.0

[chingor13]

This pull request was generated using releasetool.

02-26-2020 15:10 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)

Documentation

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

Internal / Testing Changes

• Update jacoco to 0.8.5 (#883)
• Update google format plugin upgrade (#868)

[codecov]

Codecov Report

Merging #884 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #884   +/-   ##
=========================================
  Coverage     78.63%   78.63%           
  Complexity     1163     1163           
=========================================
  Files           203      203           
  Lines          5143     5143           
  Branches        413      413           
=========================================
  Hits           4044     4044           
  Misses          925      925           
  Partials        174      174

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