deps: update dependency com.google.cloud:google-cloud-document-ai-bom…

… to v2.6.0 (#4654)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-document-ai-bom](https://togithub.com/googleapis/java-document-ai) | `2.5.2` -> `2.6.0` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-document-ai-bom/2.6.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-document-ai-bom/2.6.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-document-ai-bom/2.6.0/compatibility-slim/2.5.2)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-document-ai-bom/2.6.0/confidence-slim/2.5.2)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.6.0`](https://togithub.com/googleapis/java-document-ai/blob/HEAD/CHANGELOG.md#&#8203;260-httpsgithubcomgoogleapisjava-document-aicomparev252v260-2022-06-30)

[Compare Source](https://togithub.com/googleapis/java-document-ai/compare/v2.5.2...v2.6.0)

##### Features

-   Enable REST transport for most of Java and Go clients ([#&#8203;840](https://togithub.com/googleapis/java-document-ai/issues/840)) ([59f99a7](https://togithub.com/googleapis/java-document-ai/commit/59f99a7d47adc63811367dd1225cbbd3139bb430))

##### Bug Fixes

-   update gapic-generator-java with mock service generation fixes ([#&#8203;846](https://togithub.com/googleapis/java-document-ai/issues/846)) ([7476317](https://togithub.com/googleapis/java-document-ai/commit/74763178e522484bc29aa1d82450de18dc56613c))

</details>

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google-cloud-bom/pom.xml

@@ -413,7 +413,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-document-ai-bom</artifactId>
-        <version>2.5.2</version>
+        <version>2.6.0</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>