fix: errors in vorige commit gefixt

backend/src/routes/assignments.ts

@@ -5,6 +5,7 @@ import {
     getAllAssignmentsHandler,
     getAssignmentHandler,
     getAssignmentsSubmissionsHandler,
+    putAssignmentHandler,
 } from '../controllers/assignments.js';
 import groupRouter from './groups.js';
 
@@ -16,6 +17,8 @@ router.post('/', createAssignmentHandler);
 
 router.get('/:id', getAssignmentHandler);
 
+router.put('/:id', putAssignmentHandler);
+
 router.delete('/:id', deleteAssignmentHandler);
 
 router.get('/:id/submissions', getAssignmentsSubmissionsHandler);