deps: update dependency com.google.cloud:google-cloud-aiplatform-bom to v2.9.6 (#4485)
deps: update dependency com.google.cloud:google-cloud-aiplatform-bom to v2.9.6 (#4485)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-aiplatform-bom](https://togithub.com/googleapis/java-aiplatform) | `2.9.5` -> `2.9.6` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-aiplatform-bom/2.9.6/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-aiplatform-bom/2.9.6/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-aiplatform-bom/2.9.6/compatibility-slim/2.9.5)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-aiplatform-bom/2.9.6/confidence-slim/2.9.5)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>googleapis/java-aiplatform</summary>

### [`v2.9.6`](https://togithub.com/googleapis/java-aiplatform/blob/HEAD/CHANGELOG.md#&#8203;296-httpsgithubcomgoogleapisjava-aiplatformcomparev295v296-2022-06-06)

[Compare Source](https://togithub.com/googleapis/java-aiplatform/compare/v2.9.5...v2.9.6)

##### Dependencies

-   update dependency com.google.api.grpc:proto-google-cloud-aiplatform-v1beta1 to v0.15.5 ([#&#8203;936](https://togithub.com/googleapis/java-aiplatform/issues/936)) ([b3809ed](https://togithub.com/googleapis/java-aiplatform/commit/b3809ed85b19eb3b3dd90e30ea2013c9c399a5de))

</details>

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