bump tp-glib dep to 0.7.31 as we need it for new tube API
bump tp-glib dep to 0.7.31 as we need it for new tube API

freedesktop-unofficial-mirror/telepathy__telepathy-salut,freedesktop-unofficial-mirror/telepathy__telepathy-salut,freedesktop-unofficial-mirror/telepathy__telepathy-salut,freedesktop-unofficial-mirror/telepathy__telepathy-salut