fix typo when checking for sendgrid errors

helpers/mail.js

@@ -23,7 +23,7 @@ async function sendMail(data) {
   }
   const response = await fetch(SENDGRID_URL, fetchOptions)
 
-  if (!repsonse.ok) {
+  if (!response.ok) {
     throw new Error(
       `Failed to send booking ${data._id} to booking admin with status ${response.status}: ${response.statusText}`
     )