deps: update dependency com.google.cloud:google-cloud-spanner-bom to v6.59.0 (#1495)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-spanner-bom](https://togithub.com/googleapis/java-spanner) | `6.58.0` -> `6.59.0` | [![age](https://developer.mend.io/api/mc/badges/age/maven/com.google.cloud:google-cloud-spanner-bom/6.59.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/maven/com.google.cloud:google-cloud-spanner-bom/6.59.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/maven/com.google.cloud:google-cloud-spanner-bom/6.58.0/6.59.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/maven/com.google.cloud:google-cloud-spanner-bom/6.58.0/6.59.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>googleapis/java-spanner (com.google.cloud:google-cloud-spanner-bom)</summary>

### [`v6.59.0`](https://togithub.com/googleapis/java-spanner/blob/HEAD/CHANGELOG.md#6590-2024-02-15)

[Compare Source](https://togithub.com/googleapis/java-spanner/compare/v6.58.0...v6.59.0)

##### Features

-   Support public methods to use autogenerated admin clients. ([#&#8203;2878](https://togithub.com/googleapis/java-spanner/issues/2878)) ([53bcb3e](https://togithub.com/googleapis/java-spanner/commit/53bcb3eca2e814472c3def24e8e03d47652a8e42))

##### Dependencies

-   Update dependency com.google.cloud:sdk-platform-java-config to v3.25.0 ([#&#8203;2888](https://togithub.com/googleapis/java-spanner/issues/2888)) ([8e2da51](https://togithub.com/googleapis/java-spanner/commit/8e2da5126263c7acd134fb7fcfeb590ca190ce8e))

##### Documentation

-   README for OpenTelemetry metrics and traces ([#&#8203;2880](https://togithub.com/googleapis/java-spanner/issues/2880)) ([c8632f5](https://togithub.com/googleapis/java-spanner/commit/c8632f5b2f462420a8c2a1f4308a68a18a414472))
-   Samples and tests for database Admin APIs. ([#&#8203;2775](https://togithub.com/googleapis/java-spanner/issues/2775)) ([14ae01c](https://togithub.com/googleapis/java-spanner/commit/14ae01cd82e455a0dc22d7e3bb8c362e541ede12))

</details>

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Author: renovate-bot

pom.xml

@@ -62,7 +62,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-spanner-bom</artifactId>
-        <version>6.58.0</version>
+        <version>6.59.0</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>