deps: update dependency com.google.cloud:google-cloud-bigquerystorage-bom to v2.20.1 (#4953)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-bigquerystorage-bom](https://togithub.com/googleapis/java-bigquerystorage) | `2.20.0` -> `2.20.1` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigquerystorage-bom/2.20.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigquerystorage-bom/2.20.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigquerystorage-bom/2.20.1/compatibility-slim/2.20.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigquerystorage-bom/2.20.1/confidence-slim/2.20.0)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.20.1`](https://togithub.com/googleapis/java-bigquerystorage/blob/HEAD/CHANGELOG.md#&#8203;2201-httpsgithubcomgoogleapisjava-bigquerystoragecomparev2200v2201-2022-08-24)

[Compare Source](https://togithub.com/googleapis/java-bigquerystorage/compare/v2.20.0...v2.20.1)

##### Bug Fixes

-   Add unit test for closing disconnected streamwriter. Also reduce wait from 5->3 minutes ([#&#8203;1751](https://togithub.com/googleapis/java-bigquerystorage/issues/1751)) ([095d7d5](https://togithub.com/googleapis/java-bigquerystorage/commit/095d7d59b47becf72a5e9cd3ced383fa45b04b50))
-   allow repeated field to have a null or missing json array ([#&#8203;1760](https://togithub.com/googleapis/java-bigquerystorage/issues/1760)) ([ef24825](https://togithub.com/googleapis/java-bigquerystorage/commit/ef24825ca40e6156f6f3ce38c3c6051673a5f6cc))

##### Dependencies

-   update dependency com.google.cloud:google-cloud-bigquery to v2.14.7 ([#&#8203;1759](https://togithub.com/googleapis/java-bigquerystorage/issues/1759)) ([ac3f0b8](https://togithub.com/googleapis/java-bigquerystorage/commit/ac3f0b871a1db4bcbd5ce8fa019ae8e1559ed3ec))

</details>

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Author: renovate-bot

google-cloud-bom/pom.xml

@@ -233,7 +233,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-bigquerystorage-bom</artifactId>
-        <version>2.20.0</version>
+        <version>2.20.1</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>