Republican gubernatorial candidate Bruce Blakeman and the statewide GOP ticket blasted New York City Mayor Zohran Mamdani’s push to dramatically increase the inheritance tax that would hit the middle class — and proposed a plan Monday to stop it. The democratic socialist proposed slashing New York’s estate tax exemption from $7.35 million to $750,000, while tripling the top rate to a 50%, to help plug a projected $5.4 billion city budget deficit. “Mamdani and [Gov. Kathy] Hochul have launched a