deps: update dependency com.google.cloud:google-cloud-spanner-jdbc to v2.9.16 (#5985)

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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) | `2.9.14` -> `2.9.16` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-jdbc/2.9.16/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-jdbc/2.9.16/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-jdbc/2.9.16/compatibility-slim/2.9.14)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-jdbc/2.9.16/confidence-slim/2.9.14)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.9.16`](https://togithub.com/googleapis/java-spanner-jdbc/blob/HEAD/CHANGELOG.md#&#8203;2916-httpsgithubcomgoogleapisjava-spanner-jdbccomparev2915v2916-2023-05-15)

[Compare Source](https://togithub.com/googleapis/java-spanner-jdbc/compare/v2.9.15...v2.9.16)

##### Dependencies

-   Update dependency com.google.cloud:google-cloud-spanner-bom to v6.42.0 ([#&#8203;1231](https://togithub.com/googleapis/java-spanner-jdbc/issues/1231)) ([011570f](https://togithub.com/googleapis/java-spanner-jdbc/commit/011570ffb1d18fafe0a322d5582c5f7206349e09))

### [`v2.9.15`](https://togithub.com/googleapis/java-spanner-jdbc/blob/HEAD/CHANGELOG.md#&#8203;2915-httpsgithubcomgoogleapisjava-spanner-jdbccomparev2914v2915-2023-05-15)

[Compare Source](https://togithub.com/googleapis/java-spanner-jdbc/compare/v2.9.14...v2.9.15)

##### Dependencies

-   Update dependency com.google.cloud:google-cloud-shared-dependencies to v3.9.0 ([#&#8203;1227](https://togithub.com/googleapis/java-spanner-jdbc/issues/1227)) ([329f258](https://togithub.com/googleapis/java-spanner-jdbc/commit/329f25862a0f7118cc0419568eca3a72a053a055))

</details>

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Author: renovate-bot

google-cloud-bom/pom.xml

@@ -245,7 +245,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-spanner-jdbc</artifactId>
-        <version>2.9.14</version>
+        <version>2.9.16</version>
       </dependency>
       <dependency>
         <groupId>com.google.cloud</groupId>