feat: A new value NVIDIA_RTX_PRO_6000 is added to enum AcceleratorType (#31554)

* feat: A new value `NVIDIA_RTX_PRO_6000` is added to enum `AcceleratorType`

PiperOrigin-RevId: 811944758

Source-Link: googleapis/googleapis@bc546b9

Source-Link: googleapis/googleapis-gen@23ebd71
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google-cloud-ai_platform-v1/lib/google/cloud/aiplatform/v1/accelerator_type_pb.rb

@@ -66,6 +66,9 @@ module AcceleratorType
           # Nvidia GB200 GPU.
           NVIDIA_GB200 = 17
 
+          # Nvidia RTX Pro 6000 GPU.
+          NVIDIA_RTX_PRO_6000 = 18
+
           # TPU v2.
           TPU_V2 = 6