chore(deps): update dependency com.google.cloud:google-cloud-document-ai to v2.4.0 (#796)

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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) | `2.3.1` -> `2.4.0` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-document-ai/2.4.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-document-ai/2.4.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-document-ai/2.4.0/compatibility-slim/2.3.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-document-ai/2.4.0/confidence-slim/2.3.1)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.4.0`](https://togithub.com/googleapis/java-document-ai/blob/HEAD/CHANGELOG.md#&#8203;240-httpsgithubcomgoogleapisjava-document-aicomparev231v240-2022-03-29)

[Compare Source](https://togithub.com/googleapis/java-document-ai/compare/v2.3.1...v2.4.0)

##### Features

-   add `content` field in TextAnchor ([#&#8203;787](https://togithub.com/googleapis/java-document-ai/issues/787)) ([a0b46b5](https://togithub.com/googleapis/java-document-ai/commit/a0b46b5b81e45fe7908e3f8487582e85fddb3dab))

##### Dependencies

-   update dependency com.google.cloud:google-cloud-shared-dependencies to v2.9.0 ([#&#8203;794](https://togithub.com/googleapis/java-document-ai/issues/794)) ([7388098](https://togithub.com/googleapis/java-document-ai/commit/7388098207f7be76fff2bc9c2900e57eb65e7dfb))
-   update dependency com.google.cloud:google-cloud-storage to v2.5.1 ([#&#8203;792](https://togithub.com/googleapis/java-document-ai/issues/792)) ([8b1c13a](https://togithub.com/googleapis/java-document-ai/commit/8b1c13a091276a8e095006de66697c1532a9f4c5))

##### [2.3.1](https://togithub.com/googleapis/java-document-ai/compare/v2.3.0...v2.3.1) (2022-03-09)

##### Dependencies

-   update dependency com.google.cloud:google-cloud-storage to v2.4.5 ([#&#8203;782](https://togithub.com/googleapis/java-document-ai/issues/782)) ([e89bb8f](https://togithub.com/googleapis/java-document-ai/commit/e89bb8f518a7b5642e1a70bf397c3ae6cfd4581e))

</details>

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Author: renovate-bot

document-ai/snippets/pom.xml

@@ -41,7 +41,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-document-ai</artifactId>
-      <version>2.3.1</version>
+      <version>2.4.0</version>
     </dependency>
     <!-- [END documentai_install_with_bom] -->
     <dependency>