deps: update dependency com.google.cloud:google-cloud-spanner-jdbc to v2.30.4 (#7076)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-spanner-jdbc](https://redirect.github.com/googleapis/java-spanner-jdbc) | `2.30.2` -> `2.30.4` | [![age](https://developer.mend.io/api/mc/badges/age/maven/com.google.cloud:google-cloud-spanner-jdbc/2.30.4?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/maven/com.google.cloud:google-cloud-spanner-jdbc/2.30.4?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/maven/com.google.cloud:google-cloud-spanner-jdbc/2.30.2/2.30.4?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/maven/com.google.cloud:google-cloud-spanner-jdbc/2.30.2/2.30.4?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

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> [!WARNING]
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### Release Notes

<details>
<summary>googleapis/java-spanner-jdbc (com.google.cloud:google-cloud-spanner-jdbc)</summary>

### [`v2.30.4`](https://redirect.github.com/googleapis/java-spanner-jdbc/blob/HEAD/CHANGELOG.md#2304-2025-06-10)

[Compare Source](https://redirect.github.com/googleapis/java-spanner-jdbc/compare/v2.30.2...v2.30.4)

##### Dependencies

-   Update dependency com.google.cloud:google-cloud-spanner to v6.95.1 ([#&#8203;2085](https://redirect.github.com/googleapis/java-spanner-jdbc/issues/2085)) ([e255f89](https://redirect.github.com/googleapis/java-spanner-jdbc/commit/e255f897007e3651ca243efd0beae0926ab8d1b7))
-   Update dependency com.google.cloud:google-cloud-spanner-bom to v6.95.1 ([#&#8203;2086](https://redirect.github.com/googleapis/java-spanner-jdbc/issues/2086)) ([fd03d31](https://redirect.github.com/googleapis/java-spanner-jdbc/commit/fd03d312891a06ed7465e596802f7141b2966c3b))

</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>2.30.2</version>
+        <version>2.30.4</version>
       </dependency>
       <dependency>
         <groupId>com.google.cloud</groupId>