[Bug]: Cannot provision spot L40S in Nebius #4366

$ dstack apply -b nebius --spot --gpu 1:l40s --instance-type "gpu-l40s-a 1gpu-8vcpu-32gb" --fleet default                                 

 #  BACKEND             RESOURCES                                             INSTANCE TYPE               PRICE     
 1  nebius (eu-north1)  cpu=x86:8 mem=32GB disk=100GB gpu=L40S:48GB:1 (spot)  gpu-l40s-a 1gpu-8vcpu-32gb  $0.7492   

Submit a new run? [y/n]: y
 NAME               BACKEND  RESOURCES  INSTANCE TYPE  PRICE  STATUS       PROBES  SUBMITTED  ERROR 
 spotty-seahorse-1           -                         -      no capacity          12:12            

spotty-seahorse-1 provisioning completed (failed)
No capacity
Failed to provision in fleet 'default': tried 1 of 1 offers, all failed.
Errors: gpu-l40s-a 1gpu-8vcpu-32gb in nebius/eu-north1: Request error INVALID_ARGUMENT: spec.pricing_model is invalid; request_id: 
*****; trace_id: *****; Caused by error: 1. BadRequest in service c....
See https://dstack.ai/docs/guides/troubleshooting/#provisioning-fails