SPRINGFIELD — Plaintiffs in three lawsuits challenging the new legislative district maps that Democrats pushed through the General Assembly earlier this year have submitted their proposed changes, which would create more Latino- and Black-majority districts in Cook County and the Metro East region.The latest filings, submitted to a three-judge federal court panel Wednesday night, will be the subject of a combined hearing that is tentatively set for the week of Dec. 6, although exact dates have not yet been announced.Along …