The Caribou City Council on Monday night voted to approve a $15 million municipal budget — up $2.3 million from what it spent a year previous — that is set to raise local property taxes by upwards of 6%. The council approved the $13.5 million expense budget by a 5-0 vote, with two members, Deputy Mayor Jody Smith and Councilor Jennifer Kelley, absent. The city’s capital expense budget, which totals $1.5 million, brought more discussion. Councilo…