Fix warnings due to changes in django 3.2 to be able to customize primary keys see https://stackoverflow.com/questions/67783120/warning-auto-created-primary-key-used-when-not-defining-a-primary-key-type-by
Fix warnings due to changes in django 3.2 to be able to customize primary keys see https://stackoverflow.com/questions/67783120/warning-auto-created-primary-key-used-when-not-defining-a-primary-key-type-by

pitpalme/volunteer_planner,coders4help/volunteer_planner,pitpalme/volunteer_planner,pitpalme/volunteer_planner,volunteer-planner/volunteer_planner,christophmeissner/volunteer_planner,volunteer-planner/volunteer_planner,pitpalme/volunteer_planner,coders4help/volunteer_planner,christophmeissner/volunteer_planner,coders4help/volunteer_planner,coders4help/volunteer_planner,volunteer-planner/volunteer_planner,christophmeissner/volunteer_planner,christophmeissner/volunteer_planner,volunteer-planner/volunteer_planner