Bump mariadb-java-client from 3.0.9 to 3.1.0 in /modules/mariadb

Bumps [mariadb-java-client](https://github.com/mariadb-corporation/mariadb-connector-j) from 3.0.9 to 3.1.0.
- [Release notes](https://github.com/mariadb-corporation/mariadb-connector-j/releases)
- [Changelog](https://github.com/mariadb-corporation/mariadb-connector-j/blob/master/CHANGELOG.md)
- [Commits](https://github.com/mariadb-corporation/mariadb-connector-j/commits)

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

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

Author: dependabot[bot]

modules/mariadb/build.gradle

@@ -10,7 +10,7 @@ dependencies {
     compileOnly 'org.mariadb:r2dbc-mariadb:1.0.3'
 
     testImplementation project(':jdbc-test')
-    testImplementation 'org.mariadb.jdbc:mariadb-java-client:3.0.9'
+    testImplementation 'org.mariadb.jdbc:mariadb-java-client:3.1.0'
 
     testImplementation testFixtures(project(':r2dbc'))
     testImplementation 'org.mariadb:r2dbc-mariadb:1.0.2'