chore(deps): update dependency com.google.cloud:google-cloud-spanner-jdbc to v2.11.8 (#1322)

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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) | `2.11.7` -> `2.11.8` | [![age](https://developer.mend.io/api/mc/badges/age/maven/com.google.cloud:google-cloud-spanner-jdbc/2.11.8?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/2.11.8?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/2.11.7/2.11.8?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/2.11.7/2.11.8?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>

### [`v2.11.8`](https://togithub.com/googleapis/java-spanner-jdbc/blob/HEAD/CHANGELOG.md#2118-2023-08-15)

[Compare Source](https://togithub.com/googleapis/java-spanner-jdbc/compare/v2.11.7...v2.11.8)

##### Dependencies

-   Update dependency com.google.cloud:google-cloud-spanner-bom to v6.45.2 ([#&#8203;1318](https://togithub.com/googleapis/java-spanner-jdbc/issues/1318)) ([e924178](https://togithub.com/googleapis/java-spanner-jdbc/commit/e9241787b94cb614f658f5e6c977ffc008fd3397))

</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>2.11.7</version>
+      <version>2.11.8</version>
     </dependency>
     <!-- [END spanner-jdbc_install_without_bom] -->