BOSTON — The Boston City Council voted Wednesday to give its members a $12,000 raise just days before they go up for re-election – though most are running unopposed. The measure, which passed on a 9-4 vote, boosts councilors’ annual salaries by 14 percent, up to $99,500. It’s the first raise for the 13-member panel since 2006. The proposal was submitted by Mayor Marty Walsh and gives his office a $24,000 raise, to $199,000.