CHICAGO — At about a dozen high schools across the city Tuesday, Chicago Public Schools students held walkouts to demand aldermen vote in favor of a cease-fire resolution scheduled for the City Council on Wednesday. After a contentious delay last week, the vote is expected to be heated. Co-sponsored by Alderman Rossana Rodriguez, 33rd, and Alderman Daniel La Spata, 1st, the resolution, demands President Joe Biden and the U.S. Congress “call for and facilitate a permanent cease-fire to end the ongoing violence in Gaza; call for humanitarian assistance including medicine, food and water, to be s…