deps: update dependency com.google.cloud:google-cloud-storage to v2.15.1 (#2420)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-storage](https://togithub.com/googleapis/java-storage) | `2.15.0` -> `2.15.1` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-storage/2.15.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-storage/2.15.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-storage/2.15.1/compatibility-slim/2.15.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-storage/2.15.1/confidence-slim/2.15.0)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.15.1`](https://togithub.com/googleapis/java-storage/blob/HEAD/CHANGELOG.md#&#8203;2151-httpsgithubcomgoogleapisjava-storagecomparev2150v2151-2022-11-17)

##### Bug Fixes

-   Disable REGAPIC transport in storage v2 ([#&#8203;1762](https://togithub.com/googleapis/java-storage/issues/1762)) ([13d630e](https://togithub.com/googleapis/java-storage/commit/13d630e7ce89273c292acca7a7e048218ece4182))
-   Update GrpcStorageImpl#get(BlobId) to return null on 404 ([#&#8203;1772](https://togithub.com/googleapis/java-storage/issues/1772)) ([8c59c64](https://togithub.com/googleapis/java-storage/commit/8c59c64ccf0dd7753467b4c0f0bcf5f4b49c5bf0))

##### Documentation

-   Annotate all Option factory methods with their Nullability bounds ([#&#8203;1775](https://togithub.com/googleapis/java-storage/issues/1775)) ([3b8d137](https://togithub.com/googleapis/java-storage/commit/3b8d137a113376d7dac9010b9207d435df2622f7))

</details>

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Author: renovate-bot

pom.xml

@@ -154,7 +154,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-storage</artifactId>
-        <version>2.15.0</version>
+        <version>2.15.1</version>
         <scope>test</scope>
       </dependency>
       <dependency>