pom.xml: fix log4j version
pom.xml: fix log4j version

We want log4j 1.2.x.
This requires us to bump other Dwarf dependencies.

Signed-off-by: Pierre-Alexandre Meyer <ff019a5748a52b5641624af88a54a2f0e46a9fb5@ning.com>

pierre/collector,pierre/collector,ning/collector,pierre/collector,ning/collector,ning/collector,pierre/collector,pierre/collector,ning/collector,pierre/collector,ning/collector