deps: update dependency com.google.cloud:google-cloud-bigquerydatatransfer-bom to v1.0.6 (#778)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.cloud:google-cloud-bigquerydatatransfer-bom](https://github.com/googleapis/java-bigquerydatatransfer) | patch | `1.0.5` -> `1.0.6` |

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### Release Notes

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

### [`v1.0.6`](https://github.com/googleapis/java-bigquerydatatransfer/releases/v1.0.6)

[Compare Source](https://github.com/googleapis/java-bigquerydatatransfer/compare/v1.0.5...v1.0.6)

##### [1.0.6](https://github.com/googleapis/java-bigquerydatatransfer/compare/v1.0.5...v1.0.6) (2020-08-06)

##### Dependencies

-   update dependency com.google.cloud:google-cloud-bigquery to v1.116.8 ([#&#8203;275](https://github.com/googleapis/java-bigquerydatatransfer/issues/275)) ([49c9764](https://github.com/googleapis/java-bigquerydatatransfer/commit/49c97641d0753d447040dd341bafa5b910205cb3))

</details>

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Author: renovate-bot

pom.xml

@@ -237,7 +237,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-bigquerydatatransfer-bom</artifactId>
-        <version>1.0.5</version>
+        <version>1.0.6</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>