Not really no, there's been a bump which studies seem to agree is an aftereffect of COVID, but the media is also paying more attention to it. There's always been some amount of shootings and stabbings in Montreal, and 99% of Montreal is safe during night time.
https://www150.statcan.gc.ca/n1/pub/85-002-x/2021001/article... https://spvm.qc.ca/upload/02/2021_Activity_Report_SPVM_EN_VF...