chore(deps): update dependency com.google.cloud:google-cloud-spanner-jdbc to v2.7.12 (#1029)

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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) | `2.7.11` -> `2.7.12` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-jdbc/2.7.12/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-jdbc/2.7.12/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-jdbc/2.7.12/compatibility-slim/2.7.11)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-jdbc/2.7.12/confidence-slim/2.7.11)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.7.12`](https://togithub.com/googleapis/java-spanner-jdbc/blob/HEAD/CHANGELOG.md#&#8203;2712-httpsgithubcomgoogleapisjava-spanner-jdbccomparev2711v2712-2022-10-27)

[Compare Source](https://togithub.com/googleapis/java-spanner-jdbc/compare/v2.7.11...v2.7.12)

##### Bug Fixes

-   **java:** Initialize classes at build-time to address native image 22.2.0 issues ([#&#8203;1026](https://togithub.com/googleapis/java-spanner-jdbc/issues/1026)) ([8010da5](https://togithub.com/googleapis/java-spanner-jdbc/commit/8010da5ef539d509eb7f96d9b89edf35b2e809ad))

</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>2.7.11</version>
+      <version>2.7.12</version>
     </dependency>
     <!-- [END spanner-jdbc_install_without_bom] -->