chore(deps): update dependency com.google.cloud:google-cloud-spanner-jdbc to v2.9.0 (#1074)

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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) | `2.8.0` -> `2.9.0` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-jdbc/2.9.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-jdbc/2.9.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-jdbc/2.9.0/compatibility-slim/2.8.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-jdbc/2.9.0/confidence-slim/2.8.0)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.9.0`](https://togithub.com/googleapis/java-spanner-jdbc/blob/HEAD/CHANGELOG.md#&#8203;290-httpsgithubcomgoogleapisjava-spanner-jdbccomparev280v290-2022-12-14)

[Compare Source](https://togithub.com/googleapis/java-spanner-jdbc/compare/v2.8.0...v2.9.0)

##### Features

-   Add tests for DML with Returning clause ([#&#8203;936](https://togithub.com/googleapis/java-spanner-jdbc/issues/936)) ([8a86467](https://togithub.com/googleapis/java-spanner-jdbc/commit/8a86467c6db7a4e99fdf23cdbce2d78382f8cde9))

##### Dependencies

-   Update dependency com.google.cloud:google-cloud-shared-dependencies to v3.1.0 ([#&#8203;1069](https://togithub.com/googleapis/java-spanner-jdbc/issues/1069)) ([c2ff33a](https://togithub.com/googleapis/java-spanner-jdbc/commit/c2ff33a8f6a7051e1639fee235e1b6bba5916c3a))
-   Update dependency com.google.cloud:google-cloud-spanner-bom to v6.34.1 ([#&#8203;1072](https://togithub.com/googleapis/java-spanner-jdbc/issues/1072)) ([0045a5e](https://togithub.com/googleapis/java-spanner-jdbc/commit/0045a5e51c5a40523f70ec22c9b75bc8707dccb7))

</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>2.8.0</version>
+      <version>2.9.0</version>
     </dependency>
     <!-- [END spanner-jdbc_install_without_bom] -->