deps: update dependency com.google.cloud:google-cloud-dialogflow-bom …

…to v2.4.2 (#1225)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.cloud:google-cloud-dialogflow-bom](https://togithub.com/googleapis/java-dialogflow) | patch | `2.4.0` -> `2.4.2` |

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### Release Notes

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

### [`v2.4.2`](https://togithub.com/googleapis/java-dialogflow/blob/master/CHANGELOG.md#&#8203;242-httpswwwgithubcomgoogleapisjava-dialogflowcomparev241v242-2020-11-17)

[Compare Source](https://togithub.com/googleapis/java-dialogflow/compare/v2.4.0...v2.4.2)

</details>

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pom.xml

@@ -299,7 +299,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-dialogflow-bom</artifactId>
-        <version>2.4.0</version>
+        <version>2.4.2</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>