fix: rename artifact to google-cloud-build

[chingor13]

As requested by the Cloud Build team.

[codecov]

Codecov Report

Merging #14 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #14   +/-   ##
=========================================
  Coverage     78.98%   78.98%           
  Complexity       97       97           
=========================================
  Files             6        6           
  Lines           728      728           
  Branches          2        2           
=========================================
  Hits            575      575           
  Misses          151      151           
  Partials          2        2

Impacted Files	Coverage Δ	Complexity Δ
...udbuild/v1/stub/GrpcCloudBuildCallableFactory.java	37.5% <ø> (ø)	3 <0> (?)
...oud/devtools/cloudbuild/v1/CloudBuildSettings.java	11.86% <ø> (ø)	2 <0> (?)
...cloud/devtools/cloudbuild/v1/CloudBuildClient.java	76.47% <ø> (ø)	47 <0> (?)
...evtools/cloudbuild/v1/stub/GrpcCloudBuildStub.java	95.27% <ø> (ø)	18 <0> (?)
...ols/cloudbuild/v1/stub/CloudBuildStubSettings.java	83.77% <ø> (ø)	26 <0> (?)
...ud/devtools/cloudbuild/v1/stub/CloudBuildStub.java	5.55% <ø> (ø)	1 <0> (?)

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