chore: update gapic-generator-java to 0.0.18 (#347)
chore: update gapic-generator-java to 0.0.18 (#347)

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PiperOrigin-RevId: 350949863
Source-Link: https://github.com/googleapis/googleapis/commit/91e206bcfeaf8948ea03fe3cb1b7616108496cd3
googleapis/google-cloud-java,googleapis/google-cloud-java,googleapis/google-cloud-java