deps: update dependency com.google.cloud:google-cloud-nio to v0.124.21 (

#5643)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-nio](https://togithub.com/googleapis/java-storage-nio) | `0.124.20` -> `0.124.21` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-nio/0.124.21/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-nio/0.124.21/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-nio/0.124.21/compatibility-slim/0.124.20)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-nio/0.124.21/confidence-slim/0.124.20)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>googleapis/java-storage-nio</summary>

### [`v0.124.21`](https://togithub.com/googleapis/java-storage-nio/blob/HEAD/CHANGELOG.md#&#8203;012421-httpsgithubcomgoogleapisjava-storage-niocomparev012420v012421-2022-11-18)

[Compare Source](https://togithub.com/googleapis/java-storage-nio/compare/v0.124.20...v0.124.21)

##### Dependencies

-   Update dependency com.google.cloud:google-cloud-storage to v2.15.1 ([#&#8203;1057](https://togithub.com/googleapis/java-storage-nio/issues/1057)) ([88b1aac](https://togithub.com/googleapis/java-storage-nio/commit/88b1aace911f8b2187b5cba246ea13a143bad7ad))

</details>

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google-cloud-bom/pom.xml

@@ -219,7 +219,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-nio</artifactId>
-        <version>0.124.20</version>
+        <version>0.124.21</version>
       </dependency>
       <dependency>
         <groupId>com.google.cloud</groupId>