chore: update gapic-generator-java to 0.0.18

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PiperOrigin-RevId: 350949863
Source-Link: googleapis/googleapis@91e206b

[codecov]

Codecov Report

Merging #316 (56b0fa0) into master (e4d6630) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #316   +/-   ##
=========================================
  Coverage     68.58%   68.58%           
  Complexity      122      122           
=========================================
  Files            18       18           
  Lines           850      850           
  Branches          4        4           
=========================================
  Hits            583      583           
  Misses          259      259           
  Partials          8        8           

Impacted Files	Coverage Δ	Complexity Δ
...ai/v1beta1/DocumentUnderstandingServiceClient.java	43.75% <ø> (ø)	7.00 <0.00> (ø)
.../v1beta1/DocumentUnderstandingServiceSettings.java	21.21% <ø> (ø)	2.00 <0.00> (ø)
...v1beta1/stub/DocumentUnderstandingServiceStub.java	25.00% <ø> (ø)	1.00 <0.00> (ø)
...pcDocumentUnderstandingServiceCallableFactory.java	50.00% <ø> (ø)	4.00 <0.00> (ø)
...ta1/stub/GrpcDocumentUnderstandingServiceStub.java	79.16% <ø> (ø)	8.00 <0.00> (ø)
...ai/v1beta2/DocumentUnderstandingServiceClient.java	47.05% <ø> (ø)	9.00 <0.00> (ø)
.../v1beta2/DocumentUnderstandingServiceSettings.java	20.00% <ø> (ø)	2.00 <0.00> (ø)
...v1beta2/stub/DocumentUnderstandingServiceStub.java	20.00% <ø> (ø)	1.00 <0.00> (ø)
...pcDocumentUnderstandingServiceCallableFactory.java	50.00% <ø> (ø)	4.00 <0.00> (ø)
...ta2/stub/GrpcDocumentUnderstandingServiceStub.java	85.50% <ø> (ø)	10.00 <0.00> (ø)
... and 5 more

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