chore(deps): update dependency com.google.cloud:google-cloud-dialogfl…

…ow-cx to v0.4.0 (#86)

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This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.cloud:google-cloud-dialogflow-cx](https://togithub.com/googleapis/java-dialogflow-cx) | minor | `0.3.1` -> `0.4.0` |

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### Release Notes

<details>
<summary>googleapis/java-dialogflow-cx</summary>

### [`v0.4.0`](https://togithub.com/googleapis/java-dialogflow-cx/blob/master/CHANGELOG.md#&#8203;040-httpswwwgithubcomgoogleapisjava-dialogflow-cxcomparev031v040-2020-11-13)

[Compare Source](https://togithub.com/googleapis/java-dialogflow-cx/compare/v0.3.1...v0.4.0)

##### Features

-   add v3 client ([#&#8203;74](https://www.github.com/googleapis/java-dialogflow-cx/issues/74)) ([f1c6142](https://www.github.com/googleapis/java-dialogflow-cx/commit/f1c614229b458d18d1f631edb9a69b087a8ebbba))
-   expose matched event in Sessions API. ([#&#8203;83](https://www.github.com/googleapis/java-dialogflow-cx/issues/83)) ([22344ef](https://www.github.com/googleapis/java-dialogflow-cx/commit/22344ef0df7361dcb56b0b34d369b30b5bf482bd))

##### [0.3.1](https://www.github.com/googleapis/java-dialogflow-cx/compare/v0.3.0...v0.3.1) (2020-11-11)

##### Dependencies

-   update dependency com.google.cloud:google-cloud-shared-dependencies to v0.15.0 ([#&#8203;76](https://www.github.com/googleapis/java-dialogflow-cx/issues/76)) ([4f0bff4](https://www.github.com/googleapis/java-dialogflow-cx/commit/4f0bff488e4155e1ad1255503c497db932d4d7d8))

</details>

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dialogflow-cx/snippets/pom.xml

@@ -28,7 +28,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-dialogflow-cx</artifactId>
-      <version>0.3.1</version>
+      <version>0.4.0</version>
     </dependency>
 
     <dependency>