fix: increase max value for the grace period

- increase max value for the grace period as same as it was before in the legacy experience

src/grading-settings/deadline-section/utils.js

@@ -17,7 +17,7 @@ export function formatTime(time) {
  * @returns {boolean} - returns `true` if `inputStr` is a valid time, else `false`.
  */
 export function timerValidation(inputStr, setShowSavePrompt, setIsError) {
-  const timePattern = /^(?:[01]\d|2[0-3]):[0-5]\d$/;
+  const timePattern = /^(?:\d{2,3}):[0-5]\d$/;
 
   const isValid = timePattern.test(inputStr);
   setShowSavePrompt(isValid);