chore(deps): update dependency com.google.cloud:google-cloud-dialogflow-cx to v0.13.0 (#484)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-dialogflow-cx](https://togithub.com/googleapis/java-dialogflow-cx) | `0.12.1` -> `0.13.0` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-dialogflow-cx/0.13.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-dialogflow-cx/0.13.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-dialogflow-cx/0.13.0/compatibility-slim/0.12.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-dialogflow-cx/0.13.0/confidence-slim/0.12.1)](https://docs.renovatebot.com/merge-confidence/) |

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Author: renovate-bot

dialogflow-cx/snippets/pom.xml

@@ -28,7 +28,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-dialogflow-cx</artifactId>
-      <version>0.12.1</version>
+      <version>0.13.0</version>
     </dependency>
     <dependency>
       <groupId>com.google.code.gson</groupId>