deps: update dependency com.google.cloud:google-cloud-spanner-bom to v6.45.1 (#1312)

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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) | `6.45.0` -> `6.45.1` | [![age](https://developer.mend.io/api/mc/badges/age/maven/com.google.cloud:google-cloud-spanner-bom/6.45.1?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/6.45.1?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/6.45.0/6.45.1?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/6.45.0/6.45.1?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>

### [`v6.45.1`](https://togithub.com/googleapis/java-spanner/blob/HEAD/CHANGELOG.md#6451-2023-08-11)

[Compare Source](https://togithub.com/googleapis/java-spanner/compare/v6.45.0...v6.45.1)

##### Bug Fixes

-   Always allow metadata queries ([#&#8203;2580](https://togithub.com/googleapis/java-spanner/issues/2580)) ([ebb17fc](https://togithub.com/googleapis/java-spanner/commit/ebb17fc8aeac5fc75e4f135f33dba970f2480585))

</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>6.45.0</version>
+        <version>6.45.1</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>