change receipt limit from 7 to 10

Author: chpy04

src/frontend/src/pages/FinancePage/ReimbursementRequestForm/ReimbursementRequestForm.tsx

@@ -129,7 +129,7 @@ const schema = yup.object().shape({
     // in src/frontend/.env and set it to 'enabled'.
     (import.meta.env.MODE === 'development' && RECEIPTS_REQUIRED !== 'enabled'
       ? yup.array()
-      : yup.array().required('receipt files required').max(7, 'At most 7 Receipts are allowed')
+      : yup.array().required('receipt files required').max(10, 'At most 10 Receipts are allowed')
     ).of(yup.mixed<ReimbursementReceiptUploadArgs>().required())
 });