chore(deps): update dependency com.google.cloud:google-cloud-document-ai to v0.3.8 (#314)

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This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.cloud:google-cloud-document-ai](https://togithub.com/googleapis/java-document-ai) | patch | `0.3.6` -> `0.3.8` |
| [com.google.cloud:google-cloud-document-ai](https://togithub.com/googleapis/java-document-ai) | patch | `0.3.7` -> `0.3.8` |

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### Release Notes

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

### [`v0.3.8`](https://togithub.com/googleapis/java-document-ai/blob/master/CHANGELOG.md#&#8203;038-httpswwwgithubcomgoogleapisjava-document-aicomparev037v038-2021-01-07)

[Compare Source](https://togithub.com/googleapis/java-document-ai/compare/v0.3.7...v0.3.8)

### [`v0.3.7`](https://togithub.com/googleapis/java-document-ai/blob/master/CHANGELOG.md#&#8203;037-httpswwwgithubcomgoogleapisjava-document-aicomparev036v037-2020-12-14)

[Compare Source](https://togithub.com/googleapis/java-document-ai/compare/v0.3.6...v0.3.7)

</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>0.3.6</version>
+      <version>0.3.8</version>
     </dependency>
     <!-- [END documentai_install_with_bom] -->
     <dependency>