install_sct: updated URL pointing toward OSX binaries
install_sct: updated URL pointing toward OSX binaries


Former-commit-id: 93b51f529b6c836e8ea9d5dfc5a180349043106a [formerly 7c9d05f3561888a52578f3dd95de2290ef3c30d2]
Former-commit-id: e2edded9930d745f297784aa75bd364ba18ac85a
Former-commit-id: e3c9e65b5c0b028f919507ddd28121b0058c89f3
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox