Synack, a cybersecurity firm that specializes in finding vulnerabilities in critical systems, announced Tuesday that it is offering to test the resiliency of election systems in every state for free, ahead of this November’s elections. The firm’s founder, Jay Kaplan, made the offer in a letter to all 50 secretaries of state, writing that Synack would open its crowdsourced bug-hunting service “to any state that wants to harden their voter registration…