chore(deps): update dependency com.google.cloud:google-cloud-mediatranslation to v0.2.6 (#164)

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This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.cloud:google-cloud-mediatranslation](https://togithub.com/googleapis/java-mediatranslation) | patch | `0.2.4` -> `0.2.6` |

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### Release Notes

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

### [`v0.2.6`](https://togithub.com/googleapis/java-mediatranslation/blob/master/CHANGELOG.md#&#8203;026-httpswwwgithubcomgoogleapisjava-mediatranslationcomparev025v026-2020-11-13)

[Compare Source](https://togithub.com/googleapis/java-mediatranslation/compare/v0.2.4...v0.2.6)

</details>

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Author: renovate-bot

mediatranslation/pom.xml

@@ -27,7 +27,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-mediatranslation</artifactId>
-      <version>0.2.4</version>
+      <version>0.2.6</version>
     </dependency>
 
     <dependency>