deps: update dependency com.google.cloud:google-cloud-nio to v0.126.15 (

#5980)

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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) | `0.126.14` -> `0.126.15` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-nio/0.126.15/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-nio/0.126.15/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-nio/0.126.15/compatibility-slim/0.126.14)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-nio/0.126.15/confidence-slim/0.126.14)](https://docs.renovatebot.com/merge-confidence/) |

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### ⚠ Dependency Lookup Warnings ⚠

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### Release Notes

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

### [`v0.126.15`](https://togithub.com/googleapis/java-storage-nio/blob/HEAD/CHANGELOG.md#&#8203;012615-httpsgithubcomgoogleapisjava-storage-niocomparev012614v012615-2023-05-10)

[Compare Source](https://togithub.com/googleapis/java-storage-nio/compare/v0.126.14...v0.126.15)

##### Dependencies

-   Update dependency com.google.cloud:google-cloud-shared-dependencies to v3.9.0 ([#&#8203;1171](https://togithub.com/googleapis/java-storage-nio/issues/1171)) ([8eff3ba](https://togithub.com/googleapis/java-storage-nio/commit/8eff3ba700dcfb0f775faaf40cf415cbac51ed56))
-   Update dependency com.google.cloud:google-cloud-storage to v2.22.2 ([#&#8203;1174](https://togithub.com/googleapis/java-storage-nio/issues/1174)) ([7e4a794](https://togithub.com/googleapis/java-storage-nio/commit/7e4a794a5dff00f7d4edd5f72f848ef719c37c9c))

</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>0.126.14</version>
+        <version>0.126.15</version>
       </dependency>
       <dependency>
         <groupId>com.google.cloud</groupId>