deps: update dependency com.google.cloud:google-cloud-spanner-jdbc to v2.7.4 (#4645)

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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) | `2.7.3` -> `2.7.4` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-jdbc/2.7.4/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-jdbc/2.7.4/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-jdbc/2.7.4/compatibility-slim/2.7.3)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-spanner-jdbc/2.7.4/confidence-slim/2.7.3)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.7.4`](https://togithub.com/googleapis/java-spanner-jdbc/blob/HEAD/CHANGELOG.md#&#8203;274-httpsgithubcomgoogleapisjava-spanner-jdbccomparev273v274-2022-06-30)

[Compare Source](https://togithub.com/googleapis/java-spanner-jdbc/compare/v2.7.3...v2.7.4)

##### Dependencies

-   update dependency com.google.cloud:google-cloud-shared-dependencies to v2.13.0 ([#&#8203;899](https://togithub.com/googleapis/java-spanner-jdbc/issues/899)) ([0286068](https://togithub.com/googleapis/java-spanner-jdbc/commit/02860683f00678804c58ae2c0b213bc934441397))

</details>

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Author: renovate-bot

google-cloud-bom/pom.xml

@@ -772,7 +772,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-spanner-jdbc</artifactId>
-        <version>2.7.3</version>
+        <version>2.7.4</version>
       </dependency>
       <dependency>
         <groupId>com.google.cloud</groupId>