Remove unused dependencies

I noticed that dependency org.jsoup:jsoup:1.12.1 is declared in module tika-parsers  to prevent from having a vulnerable version from edu.ucar:grib. However, this dependency is not used and, therefore, it can be removed to make the pom clearer and the dependency tree of this module complex.

In addition, dependency net.sf.ehcache:ehcache-core, induced transitively from edu.ucar:cdm:4.5.5, is not used and can be excluded safely. Notice that the size of the jar of ehcache-core is around 1.3MB, thus removing it has a positive impact on the size of tika-parsers.