chore(deps): update dependency com.google.cloud:google-cloud-vision to v2.0.6 (#658)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-vision](https://togithub.com/googleapis/java-vision) | `2.0.5` -> `2.0.6` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-vision/2.0.6/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-vision/2.0.6/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-vision/2.0.6/compatibility-slim/2.0.5)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-vision/2.0.6/confidence-slim/2.0.5)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>googleapis/java-vision</summary>

### [`v2.0.6`](https://togithub.com/googleapis/java-vision/blob/master/CHANGELOG.md#&#8203;206-httpswwwgithubcomgoogleapisjava-visioncomparev205v206-2021-09-01)

[Compare Source](https://togithub.com/googleapis/java-vision/compare/v2.0.5...v2.0.6)

</details>

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samples/install-without-bom/pom.xml

@@ -29,7 +29,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-vision</artifactId>
-      <version>2.0.5</version>
+      <version>2.0.6</version>
     </dependency>
     <!-- [END vision_install_without_bom] -->
     <dependency>