chore(deps): update dependency com.google.cloud:google-cloud-spanner-jdbc to v2.12.0 (#1337)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-spanner-jdbc](https://togithub.com/googleapis/java-spanner-jdbc) | `2.11.9` -> `2.12.0` | [![age](https://developer.mend.io/api/mc/badges/age/maven/com.google.cloud:google-cloud-spanner-jdbc/2.12.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/maven/com.google.cloud:google-cloud-spanner-jdbc/2.12.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/maven/com.google.cloud:google-cloud-spanner-jdbc/2.11.9/2.12.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/maven/com.google.cloud:google-cloud-spanner-jdbc/2.11.9/2.12.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.12.0`](https://togithub.com/googleapis/java-spanner-jdbc/blob/HEAD/CHANGELOG.md#2120-2023-08-28)

[Compare Source](https://togithub.com/googleapis/java-spanner-jdbc/compare/v2.11.9...v2.12.0)

##### Features

-   Return generated keys ([#&#8203;1310](https://togithub.com/googleapis/java-spanner-jdbc/issues/1310)) ([9b5ab37](https://togithub.com/googleapis/java-spanner-jdbc/commit/9b5ab377587de09004474cb1cf488919fc83d6cb))

##### Bug Fixes

-   Session leak for invalid update ([#&#8203;1323](https://togithub.com/googleapis/java-spanner-jdbc/issues/1323)) ([a7d0fbb](https://togithub.com/googleapis/java-spanner-jdbc/commit/a7d0fbb529ff71b45d6ddbbad8fc3be43e7c966f))

</details>

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Author: renovate-bot

samples/install-without-bom/pom.xml

@@ -29,7 +29,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-spanner-jdbc</artifactId>
-      <version>2.11.9</version>
+      <version>2.12.0</version>
     </dependency>
     <!-- [END spanner-jdbc_install_without_bom] -->