fixed chain arb rpc url

frontend/pweb/lib/pages/payment_methods/widgets/payment_info_section.dart

@@ -60,7 +60,7 @@ class PaymentInfoSection extends StatelessWidget {
         SizedBox(height: dimensions.paddingMedium),
         if (hasRecipient && methodsForSelectedType.length > 1)
           DropdownButtonFormField<PaymentMethod>(
-            value: selectedMethod,
+            initialValue: selectedMethod,
             dropdownColor: Theme.of(context).colorScheme.onSecondary,
             decoration: InputDecoration(
               labelText: loc.paymentMethodDetails,

frontend/pweb/pubspec.yaml

@@ -16,7 +16,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 # https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
 # In Windows, build-name is used as the major, minor, and patch parts
 # of the product and file versions while build-number is used as the build suffix.
-version: 2.3.1+408
+version: 2.4.0+488
 
 environment:
   sdk: ^3.8.1