deps: update dependency com.google.cloud:google-cloud-spanner-bom to …

…v6.51.0 (#6246)

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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) | `6.50.1` -> `6.51.0` | [![age](https://developer.mend.io/api/mc/badges/age/maven/com.google.cloud:google-cloud-spanner-bom/6.51.0?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/6.51.0?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/6.50.1/6.51.0?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/6.50.1/6.51.0?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>

### [`v6.51.0`](https://togithub.com/googleapis/java-spanner/blob/HEAD/CHANGELOG.md#6510-2023-10-14)

[Compare Source](https://togithub.com/googleapis/java-spanner/compare/v6.50.1...v6.51.0)

##### Features

-   **spanner:** Add autoscaling config to the instance proto ([#&#8203;2674](https://togithub.com/googleapis/java-spanner/issues/2674)) ([8d38ca3](https://togithub.com/googleapis/java-spanner/commit/8d38ca393a6c0f9df18c9d02fa9392e11af01246))

##### Bug Fixes

-   Always include default client lib header ([#&#8203;2676](https://togithub.com/googleapis/java-spanner/issues/2676)) ([74fd174](https://togithub.com/googleapis/java-spanner/commit/74fd174a84f6f97949b9caaadddf366aafd4a469))

</details>

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### Configuration

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google-cloud-bom/pom.xml

@@ -238,7 +238,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-spanner-bom</artifactId>
-        <version>6.50.1</version>
+        <version>6.51.0</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>