deps: update dependency com.google.cloud:google-cloud-bigquerystorage-bom to v1.4.1 (#769)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.cloud:google-cloud-bigquerystorage-bom](https://github.com/googleapis/java-bigquerystorage) | patch | `1.4.0` -> `1.4.1` |

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### Release Notes

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

### [`v1.4.1`](https://github.com/googleapis/java-bigquerystorage/blob/master/CHANGELOG.md#&#8203;141-httpswwwgithubcomgoogleapisjava-bigquerystoragecomparev140v141-2020-08-10)

[Compare Source](https://github.com/googleapis/java-bigquerystorage/compare/v1.4.0...v1.4.1)

</details>

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Author: renovate-bot

pom.xml

@@ -244,7 +244,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-bigquerystorage-bom</artifactId>
-        <version>1.4.0</version>
+        <version>1.4.1</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>