Bump com.mysql:mysql-connector-j from 9.2.0 to 9.4.0 in /Plan (#4198)

Bumps [com.mysql:mysql-connector-j](https://github.com/mysql/mysql-connector-j) from 9.2.0 to 9.4.0.
- [Changelog](https://github.com/mysql/mysql-connector-j/blob/release/9.x/CHANGES)
- [Commits](mysql/mysql-connector-j@9.2.0...9.4.0)

---
updated-dependencies:
- dependency-name: com.mysql:mysql-connector-j
  dependency-version: 9.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Plan/build.gradle

@@ -74,7 +74,7 @@ subprojects {
         caffeineVersion = "3.2.2"
         jetbrainsAnnotationsVersion = "26.0.2"
         jettyVersion = "11.0.26"
-        mysqlVersion = "9.2.0"
+        mysqlVersion = "9.4.0"
         mariadbVersion = "3.5.5"
         sqliteVersion = "3.42.0.1"
         adventureVersion = "4.24.0"