New York state Democratic lawmakers are pushing to raise the corporate tax rate on businesses to help bail out Mayor Zohran Mamdani, who is facing a projected $5.4 billion deficit in the city budget , sources told The Post. “There’s a huge appetite to increase the corporate tax,” said a source who recently met with both state Assembly Speaker Carl Heastie (D-Bronx) and Senate Majority Leader Andrew Stewart-Cousins (D-Yonkers). “It’s the most popular of the menu of taxes,” the city official