Update UpcomingAssignments threshold to be 31 days

For the final project

components/UpcomingAssignments.tsx

@@ -3,8 +3,8 @@
 import { useState } from "react"
 import { ScheduleTable, getSchedule } from "./Schedule"
 
-const threshold = 3 * 7 * 24 * 60 * 60 * 1000 // 3 weeks
-const thresholdText = "3 weeks"
+const threshold = 32 * 24 * 60 * 60 * 1000 - 1 // 31 days
+const thresholdText = "31 days"
 
 const schedule = getSchedule(null)
 
@@ -23,4 +23,4 @@ export function UpcomingAssignments() {
         <div className="mb-4">{upcoming.length} {upcoming.length === 1 ? "assignment is" : "assignments are"} due in the next {thresholdText}:</div>
         <ScheduleTable items={upcoming} />
     </>
-}
+}