Add new @Cron annotation based on 'jakarta.validation'

[yyvess]

Introduced a annotation @Cron derived from 'jakarta.validation' #3270.

Also spent some time updating project dependencies and performing minor cleanup.

Each modification is in a separate commit to simplify the code review process.

• fix(code): Small code clean up
• feat(pom.xml): Update dependencies versions & maven plugins
• feat(validation): Add new @Cron annotation
• fix(test): Fix CronConverterTest that failed on Standard Time