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

…v6.12.5 (#622)

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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) | `6.12.2` -> `6.12.5` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-bom/6.12.5/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-bom/6.12.5/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-bom/6.12.5/compatibility-slim/6.12.2)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-bom/6.12.5/confidence-slim/6.12.2)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v6.12.5`](https://togithub.com/googleapis/java-spanner/blob/master/CHANGELOG.md#&#8203;6125-httpswwwgithubcomgoogleapisjava-spannercomparev6124v6125-2021-09-27)

[Compare Source](https://togithub.com/googleapis/java-spanner/compare/v6.12.2...v6.12.5)

</details>

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### Configuration

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pom.xml

@@ -62,7 +62,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-spanner-bom</artifactId>
-        <version>6.12.2</version>
+        <version>6.12.5</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>