Update `opeo-maven-plugin` According With The New Changes in `jeo-maven-plugin`

[volodya-lombrozo]

Recent changes in jeo-maven-plugin significantly changed the API between these two plugins. We need to update opeo-maven-plugin to use the latest (0.6.8 or 0.6.9) version of jeo-maven-plugin.

[h1alexbel]

@volodya-lombrozo FYI, org.eolang.jeo.representation.directives.DirectivesData was renamed to org.eolang.jeo.representation.directives.DirectivesValue.java in this commit

[volodya-lombrozo]

@h1alexbel Thanks, I will keep it in mind!