Replace spec file dependency on util-linux-core with util-linux

util-linux depends on util-linux-core on RHEL 9, so the core dependencies will
end up being installed anyway; on RHEL 8, there is no separate package for the
core, so we'll get them that way there.

server/rpm/pbench-server.spec.j2

@@ -8,7 +8,7 @@ URL:            http://github.com/distributed-systems-analysis/pbench
 Source0:        pbench-server-%{version}.tar.gz
 Buildarch:      noarch
 
-Requires: python3 python3-devel tar xz util-linux-core hostname
+Requires: python3 python3-devel tar xz util-linux hostname
 
 # policycoreutils for semanage and restorecon
 Requires:       policycoreutils