test(deps): update dependency org.mockito:mockito-core to v4.5.1 (#471)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [org.mockito:mockito-core](https://github.com/mockito/mockito) | `4.5.0` -> `4.5.1` | [![age](https://badges.renovateapi.com/packages/maven/org.mockito:mockito-core/4.5.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/org.mockito:mockito-core/4.5.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/org.mockito:mockito-core/4.5.1/compatibility-slim/4.5.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/org.mockito:mockito-core/4.5.1/confidence-slim/4.5.0)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>mockito/mockito</summary>

### [`v4.5.1`](https://github.com/mockito/mockito/releases/v4.5.1)

[Compare Source](https://github.com/mockito/mockito/compare/v4.5.0...v4.5.1)

<sup><sup>*Changelog generated by [Shipkit Changelog Gradle Plugin](https://github.com/shipkit/shipkit-changelog)*</sup></sup>

##### 4.5.1

-   2022-04-21 - [2 commit(s)](https://github.com/mockito/mockito/compare/v4.5.0...v4.5.1) by Jeremy Landis, dependabot\[bot]
-   Fixes [#&#8203;2623](https://github.com/mockito/mockito/issues/2623): Use zulu distribution and java 11 for release GHA job [(#&#8203;2624)](https://github.com/mockito/mockito/pull/2624)
-   Missing errorprone module for 4.5.0 in central as release was done with jdk 8 [(#&#8203;2623)](https://github.com/mockito/mockito/issues/2623)
-   Bump kotlinVersion from 1.6.20 to 1.6.21 [(#&#8203;2622)](https://github.com/mockito/mockito/pull/2622)

</details>

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dialogflow-cx/snippets/pom.xml

@@ -55,7 +55,7 @@
     <dependency>
       <groupId>org.mockito</groupId>
       <artifactId>mockito-core</artifactId>
-      <version>4.5.0</version>
+      <version>4.5.1</version>
       <scope>test</scope>
     </dependency>
     <dependency>