deps: update dependency com.google.cloud:google-cloud-aiplatform-bom to v2.9.8 (#4509)

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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) | `2.9.7` -> `2.9.8` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-aiplatform-bom/2.9.8/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-aiplatform-bom/2.9.8/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-aiplatform-bom/2.9.8/compatibility-slim/2.9.7)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-aiplatform-bom/2.9.8/confidence-slim/2.9.7)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.9.8`](https://togithub.com/googleapis/java-aiplatform/blob/HEAD/CHANGELOG.md#&#8203;298-httpsgithubcomgoogleapisjava-aiplatformcomparev297v298-2022-06-21)

[Compare Source](https://togithub.com/googleapis/java-aiplatform/compare/v2.9.7...v2.9.8)

##### Dependencies

-   update dependency com.google.api.grpc:proto-google-cloud-aiplatform-v1beta1 to v0.15.7 ([#&#8203;954](https://togithub.com/googleapis/java-aiplatform/issues/954)) ([906be50](https://togithub.com/googleapis/java-aiplatform/commit/906be50a6fe0ad4b72fecd23007bc88a6f83c83e))

</details>

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Author: renovate-bot

google-cloud-bom/pom.xml

@@ -179,7 +179,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-aiplatform-bom</artifactId>
-        <version>2.9.7</version>
+        <version>2.9.8</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>