sysutils/py-salt: Add py311-setproctitle as mandatory dependency

The salt-minion process sets its process title differently when
py311-setproctitle is installed, changing from "/usr/local/bin/salt-minion"
to "python3.11: MultiMinionProcessManager MinionProcessManager". This affects
the RC script's ability to properly check process status and stop the service.

Making py311-setproctitle a mandatory dependency ensures consistent process
naming behavior, fixing the "service salt_minion status" and
"service salt_minion stop" commands.

PR: 285053
Reported by: asomers