pom.xml: drop unneeded logging dependencies
pom.xml: drop unneeded logging dependencies

pom.xml specifies a dependency on slf4j (the Simple Logging Facade for
Java) and its ancient log4j backend (slf4j-log4j12), but we don't
actually use it the scylla-jmx project - we use the standard
java.util.logging.

So let's drop the unnecessary (and these log4shell days, scary) dependencies.

Signed-off-by: Nadav Har'El <625169824b719df98706d88646d0aae6f368ae4d@scylladb.com>
Message-Id: <20211213083055.1383507-1-625169824b719df98706d88646d0aae6f368ae4d@scylladb.com>

scylladb/scylla-jmx,scylladb/scylla-jmx,scylladb/scylla-jmx