Change default gpu count to 1.. (#2624)

Author: r4victor

src/dstack/_internal/core/models/resources.py

@@ -126,7 +126,7 @@ def __str__(self):
 
 DEFAULT_CPU_COUNT = Range[int](min=2)
 DEFAULT_MEMORY_SIZE = Range[Memory](min=Memory.parse("8GB"))
-DEFAULT_GPU_COUNT = Range[int](min=1, max=1)
+DEFAULT_GPU_COUNT = Range[int](min=1)
 
 
 class CPUSpec(CoreModel):