The city of Chicago dropped its lawsuit Wednesday against the police union in its fight over city employee COVID-19 vaccine orders, saying the complaint became unnecessary as more officers complied. The move follows a judge’s ruling last month to suspend an end-of-the-year city deadline for police officers to get vaccinated. Still, Mayor Lori Lightfoot vowed Wednesday that if union leaders revived talk of an “illegal work stoppage” over the mandate, the city would return to court. The city sued the Fraternal Order of …