chore(deps): update dependency com.google.cloud:google-cloud-document-ai to v1.2.1 (#547)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-document-ai](https://togithub.com/googleapis/java-document-ai) | `1.2.0` -> `1.2.1` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-document-ai/1.2.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-document-ai/1.2.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-document-ai/1.2.1/compatibility-slim/1.2.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-document-ai/1.2.1/confidence-slim/1.2.0)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>googleapis/java-document-ai</summary>

### [`v1.2.1`](https://togithub.com/googleapis/java-document-ai/blob/master/CHANGELOG.md#&#8203;121-httpswwwgithubcomgoogleapisjava-document-aicomparev120v121-2021-07-14)

[Compare Source](https://togithub.com/googleapis/java-document-ai/compare/v1.2.0...v1.2.1)

</details>

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document-ai/snippets/pom.xml

@@ -41,7 +41,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-document-ai</artifactId>
-      <version>1.2.0</version>
+      <version>1.2.1</version>
     </dependency>
     <!-- [END documentai_install_with_bom] -->
     <dependency>