[Bug]: Cannot get cloud GPU offers

[jvstme]

Steps to reproduce

Apply this configuration:

type: dev-environment
ide: vscode
resources:
  gpu: 1

Actual behaviour

No offers.

> dstack apply
 Project          ilya                                  
 User             admin                                 
 Configuration    .dstack.yml                           
 Type             dev-environment                       
 Resources        2..xCPU, 8GB.., 1xGPU, 100GB.. (disk) 
 Max price        -                                     
 Max duration     6h                                    
 Spot policy      on-demand                             
 Retry policy     -                                     
 Creation policy  reuse-or-create                       
 Idle duration    5m                                    
 Reservation      -                                     

Submit a new run? [y/n]

Expected behaviour

Cloud offers suggested.

dstack version

master

Server logs

ERROR    dstack._internal.server.services.backends:435 Got exception when requesting offers from backend BackendType.RUNPOD                        
                    Traceback (most recent call last):                                                                                                        
                      File "/home/jvstme/git/dstack/dstack/src/dstack/_internal/utils/common.py", line 20, in run_async                                       
                        return await asyncio.get_running_loop().run_in_executor(None, func_with_args)                                                         
                      File "/usr/lib64/python3.9/concurrent/futures/thread.py", line 58, in run                                                               
                        result = self.fn(*self.args, **self.kwargs)                                                                                           
                      File "/home/jvstme/git/dstack/dstack/venv/lib64/python3.9/site-packages/cachetools/__init__.py", line 832, in wrapper                   
                        k = key(self, *args, **kwargs)                                                                                                        
                      File "/home/jvstme/git/dstack/dstack/src/dstack/_internal/core/backends/base/compute.py", line 191, in _get_offers_cached_key           
                        return hash(json.dumps(requirements.dict(), sort_keys=True))                                                                          
                      File "/usr/lib64/python3.9/json/__init__.py", line 234, in dumps                                                                        
                        return cls(                                                                                                                           
                      File "/usr/lib64/python3.9/json/encoder.py", line 199, in encode                                                                        
                        chunks = self.iterencode(o, _one_shot=True)                                                                                           
                      File "/usr/lib64/python3.9/json/encoder.py", line 257, in iterencode                                                                    
                        return _iterencode(o, 0)                                                                                                              
                      File "/usr/lib64/python3.9/json/encoder.py", line 179, in default                                                                       
                        raise TypeError(f'Object of type {o.__class__.__name__} '                                                                             
                    TypeError: Object of type AcceleratorVendor is not JSON serializable

Additional information

No response