chore: Updating mysql test dependencies in pom.xml (#39146)

## Description
> [!TIP]  
> _Add a TL;DR when the description is longer than 500 words or
extremely technical (helps the content, marketing, and DevRel team)._
>
> _Please also include relevant motivation and context. List any
dependencies that are required for this change. Add links to Notion,
Figma or any other documents that might be relevant to the PR._


Fixes Dependabot alert.

> [!WARNING]  
> _If no issue exists, please create an issue first, and check with the
maintainers if the issue is valid._

## Automation

/test sanity

### 🔍 Cypress test results
<!-- This is an auto-generated comment: Cypress test results  -->
> [!IMPORTANT]
> 🟣 🟣 🟣 Your tests are running.
> Tests running at:
<https://github.com/appsmithorg/appsmith/actions/runs/13236027815>
> Commit: 8d7776053f692e42e52ffc037f45df3063d06d1c
> Workflow: `PR Automation test suite`
> Tags: `@tag.Sanity`
> Spec: ``
> <hr>Mon, 10 Feb 2025 07:56:09 UTC
<!-- end of auto-generated comment: Cypress test results  -->


## Communication
Should the DevRel and Marketing teams inform users about this change?
- [ ] Yes
- [ ] No


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

- **Chores**
- Updated the backend database connector to a newer version, enhancing
stability and compatibility during testing. This internal improvement
supports smoother operations and sets the stage for future reliability
enhancements, though no direct user interface changes have been
introduced.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

app/server/appsmith-plugins/mysqlPlugin/pom.xml

@@ -86,9 +86,9 @@
 
         <!-- Test Dependencies -->
         <dependency>
-            <groupId>mysql</groupId>
-            <artifactId>mysql-connector-java</artifactId>
-            <version>8.0.28</version>
+            <groupId>com.mysql</groupId>
+            <artifactId>mysql-connector-j</artifactId>
+            <version>9.2.0</version>
             <scope>test</scope>
         </dependency>