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

…v6.23.3 (#4262)

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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) | `6.23.2` -> `6.23.3` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-bom/6.23.3/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-bom/6.23.3/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-bom/6.23.3/compatibility-slim/6.23.2)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-bom/6.23.3/confidence-slim/6.23.2)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v6.23.3`](https://togithub.com/googleapis/java-spanner/blob/HEAD/CHANGELOG.md#&#8203;6233-httpsgithubcomgoogleapisjava-spannercomparev6232v6233-2022-04-21)

[Compare Source](https://togithub.com/googleapis/java-spanner/compare/v6.23.2...v6.23.3)

</details>

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pom.xml

@@ -744,7 +744,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-spanner-bom</artifactId>
-        <version>6.23.2</version>
+        <version>6.23.3</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>