build: install-deps.sh installs system boost on Jammy
Since on Jammy system boost is new enough for Pacific and we don't have
Jammy packages for older boost (we only have those for Bionic), just
install the system packages rather than fetching ceph-libboost.
No analogous commit exists in main as while main's Jammy case installs
ceph-libboost, we just need a system package here.
Fixes: https://tracker.ceph.com/issues/62103 Signed-off-by: Adam Emerson <aemerson@redhat.com>