fix(filters): invalid filter range when converting dates to strings

Resolves https://community.vikunja.io/t/my-vikunja-instance-creates-tasks-with-due-date-time-of-9am-for-tasks-with-the-word-today-word-in-it/2105/10

frontend/src/services/taskCollection.ts

@@ -4,7 +4,7 @@ import TaskModel from '@/models/task'
 import type {ITask} from '@/modelTypes/ITask'
 
 export interface TaskFilterParams {
-	sort_by: ('start_date' | 'done' | 'id' | 'position' | 'kanban_position')[],
+	sort_by: ('start_date' | 'end_date' | 'due_date' | 'done' | 'id' | 'position' | 'kanban_position')[],
 	order_by: ('asc' | 'desc')[],
 	filter: string,
 	filter_include_nulls: boolean,