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

… v2.7.9 (#5435)

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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) | `2.7.8` -> `2.7.9` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-jdbc/2.7.9/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-jdbc/2.7.9/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-jdbc/2.7.9/compatibility-slim/2.7.8)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-jdbc/2.7.9/confidence-slim/2.7.8)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.7.9`](https://togithub.com/googleapis/java-spanner-jdbc/blob/HEAD/CHANGELOG.md#&#8203;279-httpsgithubcomgoogleapisjava-spanner-jdbccomparev278v279-2022-10-06)

[Compare Source](https://togithub.com/googleapis/java-spanner-jdbc/compare/v2.7.8...v2.7.9)

##### Dependencies

-   Update dependency com.google.cloud:google-cloud-spanner-bom to v6.31.2 ([#&#8203;1002](https://togithub.com/googleapis/java-spanner-jdbc/issues/1002)) ([f2ac8e3](https://togithub.com/googleapis/java-spanner-jdbc/commit/f2ac8e392e972d326bc5702855385471febea87c))

</details>

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google-cloud-bom/pom.xml

@@ -772,7 +772,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-spanner-jdbc</artifactId>
-        <version>2.7.8</version>
+        <version>2.7.9</version>
       </dependency>
       <dependency>
         <groupId>com.google.cloud</groupId>