chore(deps): update dependency com.google.cloud:google-cloud-aiplatform to v2.9.0 (#914)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-aiplatform](https://github.com/googleapis/java-) | `2.8.9` -> `2.9.0` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-aiplatform/2.9.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-aiplatform/2.9.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-aiplatform/2.9.0/compatibility-slim/2.8.9)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-aiplatform/2.9.0/confidence-slim/2.8.9)](https://docs.renovatebot.com/merge-confidence/) |

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Author: renovate-bot

README.md

@@ -18,7 +18,7 @@ If you are using Maven with [BOM][libraries-bom], add this to your pom.xml file
   <dependency>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-aiplatform</artifactId>
-    <version>2.8.9</version>
+    <version>2.9.0</version>
   </dependency>
 
 ```
@@ -30,7 +30,7 @@ If you are using Maven without BOM, add this to your dependencies:
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-aiplatform</artifactId>
-  <version>2.8.9</version>
+  <version>2.9.0</version>
 </dependency>
 
 ```

samples/install-without-bom/pom.xml

@@ -29,7 +29,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-aiplatform</artifactId>
-      <version>2.8.9</version>
+      <version>2.9.0</version>
     </dependency>
     <!-- [END aiplatform_install_without_bom] -->
     <dependency>

samples/snippets/pom.xml

@@ -27,7 +27,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-aiplatform</artifactId>
-      <version>2.8.9</version>
+      <version>2.9.0</version>
     </dependency>
     <!-- [END aiplatform_install_with_bom] -->
     <dependency>