chore(deps): update dependency com.google.cloud:google-cloud-dialogflow-cx to v0.6.0 (#148)

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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) | `0.5.0` -> `0.6.0` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-dialogflow-cx/0.6.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-dialogflow-cx/0.6.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-dialogflow-cx/0.6.0/compatibility-slim/0.5.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-dialogflow-cx/0.6.0/confidence-slim/0.5.0)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v0.6.0`](https://togithub.com/googleapis/java-dialogflow-cx/blob/master/CHANGELOG.md#&#8203;060-httpswwwgithubcomgoogleapisjava-dialogflow-cxcomparev050v060-2021-02-25)

[Compare Source](https://togithub.com/googleapis/java-dialogflow-cx/compare/v0.5.0...v0.6.0)

##### Features

-   add experiment and security settings API docs: update comments on parameters and agent ([#&#8203;124](https://www.github.com/googleapis/java-dialogflow-cx/issues/124)) ([06ee69a](https://www.github.com/googleapis/java-dialogflow-cx/commit/06ee69ac49cdd2f0cc6316e7613d120434dfb65f))
-   Add new Experiment service ([a79149b](https://www.github.com/googleapis/java-dialogflow-cx/commit/a79149b73f3c74b7d35ec230702fc9f61c2ede3b))
-   added support for test cases and agent validation ([#&#8203;141](https://www.github.com/googleapis/java-dialogflow-cx/issues/141)) ([a79149b](https://www.github.com/googleapis/java-dialogflow-cx/commit/a79149b73f3c74b7d35ec230702fc9f61c2ede3b))
-   Support transition route group coverage for Test Cases ([a79149b](https://www.github.com/googleapis/java-dialogflow-cx/commit/a79149b73f3c74b7d35ec230702fc9f61c2ede3b))
-   supports SentimentAnalysisResult in webhook request ([a79149b](https://www.github.com/googleapis/java-dialogflow-cx/commit/a79149b73f3c74b7d35ec230702fc9f61c2ede3b))

##### Bug Fixes

-   don't log downloads ([#&#8203;143](https://www.github.com/googleapis/java-dialogflow-cx/issues/143)) ([7cfb674](https://www.github.com/googleapis/java-dialogflow-cx/commit/7cfb6749ede7e7b01d606e83b6ac414466d23378))
-   RunTestCase http template. PHP REST client lib can be generated ([a79149b](https://www.github.com/googleapis/java-dialogflow-cx/commit/a79149b73f3c74b7d35ec230702fc9f61c2ede3b))
-   update repo name ([#&#8203;138](https://www.github.com/googleapis/java-dialogflow-cx/issues/138)) ([5a6c5d1](https://www.github.com/googleapis/java-dialogflow-cx/commit/5a6c5d127d298c4d3acd5fdf13839c17b9f64d08))

##### Dependencies

-   update dependency com.google.cloud:google-cloud-shared-dependencies to v0.19.0 ([#&#8203;127](https://www.github.com/googleapis/java-dialogflow-cx/issues/127)) ([0452e5c](https://www.github.com/googleapis/java-dialogflow-cx/commit/0452e5cc405d1fadf4d76f20d92db79375da7cd6))

##### Documentation

-   fix languages link ([#&#8203;146](https://www.github.com/googleapis/java-dialogflow-cx/issues/146)) ([89f5b49](https://www.github.com/googleapis/java-dialogflow-cx/commit/89f5b49f8b973f626dbe76286b6cf8273d447837))
-   generate sample code in the Java microgenerator ([a79149b](https://www.github.com/googleapis/java-dialogflow-cx/commit/a79149b73f3c74b7d35ec230702fc9f61c2ede3b))
-   minor doc update on redact field in intent.proto and page.proto ([a79149b](https://www.github.com/googleapis/java-dialogflow-cx/commit/a79149b73f3c74b7d35ec230702fc9f61c2ede3b))
-   minor updates in wording ([a79149b](https://www.github.com/googleapis/java-dialogflow-cx/commit/a79149b73f3c74b7d35ec230702fc9f61c2ede3b))
-   test cases doc update ([a79149b](https://www.github.com/googleapis/java-dialogflow-cx/commit/a79149b73f3c74b7d35ec230702fc9f61c2ede3b))

</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>0.5.0</version>
+      <version>0.6.0</version>
     </dependency>
 
     <dependency>