chore(deps): update dependency com.google.cloud:google-cloud-document…

…-ai to v2.1.9 (#723)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-document-ai](https://github.com/googleapis/java-document-ai) | `2.1.8` -> `2.1.9` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-document-ai/2.1.9/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-document-ai/2.1.9/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-document-ai/2.1.9/compatibility-slim/2.1.8)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-document-ai/2.1.9/confidence-slim/2.1.8)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.1.9`](https://github.com/googleapis/java-document-ai/blob/HEAD/CHANGELOG.md#&#8203;219-httpswwwgithubcomgoogleapisjava-document-aicomparev218v219-2022-01-07)

[Compare Source](https://github.com/googleapis/java-document-ai/compare/v2.1.8...v2.1.9)

</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>2.1.8</version>
+      <version>2.1.9</version>
     </dependency>
     <!-- [END documentai_install_with_bom] -->
     <dependency>