Bugfix: Change get() -> GetDLTensorPtr() in cutlass FusedMoE validations (#1995)

## 📌 Description
Using different API after `apach-tvm-ffi` version bump.

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Bug Fixes**
* Improved null-pointer validation for FP8 quantization tensors used
during inference, increasing robustness and reducing risk of runtime
errors.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

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Signed-off-by: Amir Klein <[email protected]>

Author: amirkl94

csrc/fused_moe/cutlass_backend/flashinfer_cutlass_fused_moe_sm100_binding.cu

@@ -822,11 +822,12 @@ class FusedMoeRunner : public tvm::ffi::ModuleObj {
       auto const fc2_dequant = quant_scales.value()[2];
       auto const fc1_input_dequant = quant_scales.value()[3];
 
-      TVM_FFI_ICHECK(fc1_dequant.get() != nullptr) << "Expecting fc1_dequant to be non null";
-      TVM_FFI_ICHECK(fc2_quant.get() != nullptr) << "Expecting fc2_quant to be non null";
-      TVM_FFI_ICHECK(fc2_dequant.get() != nullptr)
-          << "Expecting fc2_dequant_dequant to be non null";
-      TVM_FFI_ICHECK(fc1_input_dequant.get() != nullptr)
+      TVM_FFI_ICHECK(fc1_dequant.GetDLTensorPtr() != nullptr)
+          << "Expecting fc1_dequant to be non null";
+      TVM_FFI_ICHECK(fc2_quant.GetDLTensorPtr() != nullptr) << "Expecting fc2_quant to be non null";
+      TVM_FFI_ICHECK(fc2_dequant.GetDLTensorPtr() != nullptr)
+          << "Expecting fc2_dequant to be non null";
+      TVM_FFI_ICHECK(fc1_input_dequant.GetDLTensorPtr() != nullptr)
           << "Expecting fc1_input_dequant to be non null";
 
       // Check types