deps: update dependency com.google.cloud:google-cloud-spanner-bom to v6.84.0 (#1881)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-spanner-bom](https://redirect.github.com/googleapis/java-spanner) | `6.83.0` -> `6.84.0` | [![age](https://developer.mend.io/api/mc/badges/age/maven/com.google.cloud:google-cloud-spanner-bom/6.84.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/maven/com.google.cloud:google-cloud-spanner-bom/6.84.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/maven/com.google.cloud:google-cloud-spanner-bom/6.83.0/6.84.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/maven/com.google.cloud:google-cloud-spanner-bom/6.83.0/6.84.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

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

### [`v6.84.0`](https://redirect.github.com/googleapis/java-spanner/blob/HEAD/CHANGELOG.md#6840-2025-01-06)

[Compare Source](https://redirect.github.com/googleapis/java-spanner/compare/v6.83.0...v6.84.0)

##### Features

-   Add support for ARRAY\<STRUCT> to CloudCilentExecutor ([#&#8203;3544](https://redirect.github.com/googleapis/java-spanner/issues/3544)) ([6cbaf7e](https://redirect.github.com/googleapis/java-spanner/commit/6cbaf7ec6502d04fc0a0c09720e2054bd10bead9))
-   Add transaction runner for connections ([#&#8203;3559](https://redirect.github.com/googleapis/java-spanner/issues/3559)) ([5a1be3d](https://redirect.github.com/googleapis/java-spanner/commit/5a1be3dedeafa6858502eadc7918820b9cd90f68))
-   Exposing InstanceType in Instance configuration (to define PROVISIONED or FREE spanner instance) ([8d295c4](https://redirect.github.com/googleapis/java-spanner/commit/8d295c4a4030b4e97b1d653cc3baf412864f3042))
-   Improve tracing by adding attributes ([#&#8203;3576](https://redirect.github.com/googleapis/java-spanner/issues/3576)) ([eee333b](https://redirect.github.com/googleapis/java-spanner/commit/eee333b51fa69123e011dfbd2a0896fd31ac10dc))
-   **spanner:** Add jdbc support for external hosts ([#&#8203;3536](https://redirect.github.com/googleapis/java-spanner/issues/3536)) ([801346a](https://redirect.github.com/googleapis/java-spanner/commit/801346a1b2efe7d0144f7442e1568eb5b02ddcbc))

##### Bug Fixes

-   AsyncTransactionManager did not always close the session ([#&#8203;3580](https://redirect.github.com/googleapis/java-spanner/issues/3580)) ([d9813a0](https://redirect.github.com/googleapis/java-spanner/commit/d9813a05240b966f444168d3b8c30da9d27a8cc4))
-   Retry specific internal errors ([#&#8203;3565](https://redirect.github.com/googleapis/java-spanner/issues/3565)) ([b9ce1a6](https://redirect.github.com/googleapis/java-spanner/commit/b9ce1a6fcbd11373a5cc82807af15c1cca0dd48e))
-   Update max_in_use_session at 10 mins interval ([#&#8203;3570](https://redirect.github.com/googleapis/java-spanner/issues/3570)) ([cc1753d](https://redirect.github.com/googleapis/java-spanner/commit/cc1753da72b3e508f8fea8a6d19e1ed3f34e3602))

##### Dependencies

-   Update opentelemetry.version to v1.45.0 ([#&#8203;3531](https://redirect.github.com/googleapis/java-spanner/issues/3531)) ([78c82ed](https://redirect.github.com/googleapis/java-spanner/commit/78c82edb4fcc4a5a9a372225ca429038c3b34955))

</details>

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Author: renovate-bot

pom.xml

@@ -61,7 +61,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-spanner-bom</artifactId>
-        <version>6.83.0</version>
+        <version>6.84.0</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>

samples/spring-data-jdbc/pom.xml

@@ -30,7 +30,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-spanner-bom</artifactId>
-        <version>6.83.0</version>
+        <version>6.84.0</version>
         <scope>import</scope>
         <type>pom</type>
       </dependency>