deps: update dependency com.google.cloud:google-cloud-core to v2.8.9 (#987)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-core](https://github.com/googleapis/java-core) | `2.8.8` -> `2.8.9` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-core/2.8.9/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-core/2.8.9/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-core/2.8.9/compatibility-slim/2.8.8)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-core/2.8.9/confidence-slim/2.8.8)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.8.9`](https://github.com/googleapis/java-core/blob/HEAD/CHANGELOG.md#&#8203;289-httpsgithubcomgoogleapisjava-corecomparev288v289-2022-08-16)

[Compare Source](https://github.com/googleapis/java-core/compare/v2.8.8...v2.8.9)

##### Dependencies

-   update dependency com.google.auth:google-auth-library-bom to v1.10.0 ([#&#8203;900](https://github.com/googleapis/java-core/issues/900)) ([c01b47a](https://github.com/googleapis/java-core/commit/c01b47a122a9036f8c594cb583dab3512a257597))
-   update dependency com.google.protobuf:protobuf-bom to v3.21.5 ([#&#8203;901](https://github.com/googleapis/java-core/issues/901)) ([13e2fd6](https://github.com/googleapis/java-core/commit/13e2fd6fbae1d34385ec500aaf4a2b38e19dd6de))
-   update dependency org.threeten:threetenbp to v1.6.1 ([#&#8203;902](https://github.com/googleapis/java-core/issues/902)) ([02dac62](https://github.com/googleapis/java-core/commit/02dac62784a6614291836917b022a32745312157))

</details>

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Author: renovate-bot

dialogflow/snippets/pom.xml

@@ -47,7 +47,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-core</artifactId>
-      <version>2.8.8</version>
+      <version>2.8.9</version>
       <scope>test</scope>
       <classifier>tests</classifier>
     </dependency>