Update mkFit to V3.4.0-0#7387

cmsbuild merged 1 commit intocms-sw:IB/CMSSW_12_1_X/mastercms-sw/cmsdist:IB/CMSSW_12_1_X/masterfrom

mmasciov:updateMkFit_12_1_0_pre5mmasciov/cmsdist:updateMkFit_12_1_0_pre5Copy head branch name to clipboard