deps: update dependency com.google.cloud:google-cloud-vision-bom to v…

…1.99.3 (#507)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.cloud:google-cloud-vision-bom](https://togithub.com/googleapis/java-vision) | patch | `1.99.2` -> `1.99.3` |

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### Release Notes

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

### [`v1.99.3`](https://togithub.com/googleapis/java-vision/blob/master/CHANGELOG.md#&#8203;1993-httpswwwgithubcomgoogleapisjava-visioncomparev1992v1993-2020-04-07)

[Compare Source](https://togithub.com/googleapis/java-vision/compare/v1.99.2...v1.99.3)

</details>

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pom.xml

@@ -599,7 +599,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-vision-bom</artifactId>
-        <version>1.99.2</version>
+        <version>1.99.3</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>