Fixing minor warning during compilation.

Updated BitBucket pipeline, OpenJDK Docker images are now deprecated,
moving to Eclipse Temurin

Replacing Thread.getId() with Thread.threadId()

Updated Maven Wrapper to 3.2.0

Updated Maven to 3.9.5

Updated Apache Log4J to 2.22.0

SLF4J 1.7.32 to 2.0.6
Java Mail API 1.6.2 to 2.1.1 (new Jakarta implementation)
L2J Commons 2.6.5.1 to 2.6.6.1 (MariaDB Java Client 3.1.2, HikariCP
5.0.1)

Updated BitBucket pipeline.
Update Apache Maven Wrapper.

Updated SLF4J from 1.7.31 to 1.7.32.

Simplified database configuration.
Updated SLF4J from 1.7.30 to 1.7.31.
Updated Log4J from 2.13.3 to 2.14.1.
Updated L2J Commons from 2.6.4.0 to 2.6.5.1.

Reduced build from 11 MB to 3 MB.

Fixed several typos.
Updated L2J Commons to 2.6.3.0.
Updated MMO Core to 2.6.2.0.