Bump org.mariadb.jdbc:mariadb-java-client in /modules/mariadb

Bumps [org.mariadb.jdbc:mariadb-java-client](https://github.com/mariadb-corporation/mariadb-connector-j) from 3.5.5 to 3.5.6.
- [Release notes](https://github.com/mariadb-corporation/mariadb-connector-j/releases)
- [Changelog](https://github.com/mariadb-corporation/mariadb-connector-j/blob/main/CHANGELOG.md)
- [Commits](mariadb-corporation/mariadb-connector-j@3.5.5...3.5.6)

---
updated-dependencies:
- dependency-name: org.mariadb.jdbc:mariadb-java-client
  dependency-version: 3.5.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

modules/mariadb/build.gradle

@@ -7,7 +7,7 @@ dependencies {
     compileOnly 'org.mariadb:r2dbc-mariadb:1.0.3'
 
     testImplementation project(':testcontainers-jdbc-test')
-    testImplementation 'org.mariadb.jdbc:mariadb-java-client:3.5.5'
+    testImplementation 'org.mariadb.jdbc:mariadb-java-client:3.5.6'
 
     testImplementation testFixtures(project(':testcontainers-r2dbc'))
     testRuntimeOnly 'org.mariadb:r2dbc-mariadb:1.0.3'