fix: remove unused import of PaymentCustomerRequest from sessions.py

Author: armando-rodriguez-cko

checkout_sdk/payments/sessions/sessions.py

@@ -2,7 +2,7 @@
 from enum import Enum
 
 from checkout_sdk.common.enums import Currency
-from checkout_sdk.payments.payments import PaymentType, BillingDescriptor, PaymentCustomerRequest, ShippingDetails, \
+from checkout_sdk.payments.payments import PaymentType, BillingDescriptor, ShippingDetails, \
     PaymentRecipient, ProcessingSettings, RiskRequest, ThreeDsRequest, PaymentSender