Add support for newer mariaDB version

[ipr0310]

As Signum-node now requires newer MariaDB version, the pool's ORM must be updated in order to operate seamlessly.

2024-06-12 16:11:14.651 [INFO ] [main] DatabaseFactory - Database: jdbc:mariadb://localhost:3306/pool_babel (MySQL 10.6)
2024-06-12 16:11:14.771 [WARN ] [main] Database - Flyway upgrade recommended: MariaDB 10.6 is newer than this version of Flyway and support has not been tested. The latest supported version of MariaDB is 10.4.
2024-06-12 16:11:14.968 [INFO ] [main] DbValidate - Successfully validated 6 migrations (execution time 00:00.131s)
2024-06-12 16:11:14.987 [INFO ] [main] DbMigrate - Current version of schema pool_babel: 3.3
2024-06-12 16:11:14.988 [WARN ] [main] DbMigrate - Schema pool_babel has a version (3.3) that is newer than the latest available migration (2.3) !
2024-06-12 16:11:14.989 [INFO ] [main] DbMigrate - Schema pool_babel is up to date. No migration necessary.

[ipr0310]

Error reported by pool operator Shadow

[jjos2372]

Hello, it says WARN, which should be a warning, not an error. Anyway, let's update the flyway library.