chore(deps): update dependency com.google.cloud:google-cloud-datacatalog to v1.5.6 (GoogleCloudPlatform#6005)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-datacatalog](https://togithub.com/googleapis/java-datacatalog) | `1.5.5` -> `1.5.6` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-datacatalog/1.5.6/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-datacatalog/1.5.6/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-datacatalog/1.5.6/compatibility-slim/1.5.5)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-datacatalog/1.5.6/confidence-slim/1.5.5)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v1.5.6`](https://togithub.com/googleapis/java-datacatalog/blob/master/CHANGELOG.md#&#8203;156-httpswwwgithubcomgoogleapisjava-datacatalogcomparev155v156-2021-09-15)

[Compare Source](https://togithub.com/googleapis/java-datacatalog/compare/v1.5.5...v1.5.6)

</details>

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Author: renovate-bot

datacatalog/quickstart/pom.xml

@@ -39,7 +39,7 @@
         <dependency>
             <groupId>com.google.cloud</groupId>
             <artifactId>google-cloud-datacatalog</artifactId>
-            <version>1.5.5</version>
+            <version>1.5.6</version>
         </dependency>
 
         <!-- Test dependencies -->