Update super_resolution_with_onnxruntime.py (pytorch#2647)

add install for onnx

Fixes pytorch#2646

Description
Install ONNX to avoid dependency issues

---------

Co-authored-by: Nikita Shulga <2453524+malfet@users.noreply.github.com>

Author: ahoblitz

advanced_source/super_resolution_with_onnxruntime.py

@@ -26,7 +26,7 @@
 .. code-block:: bash
 
    %%bash
-   pip install onnxruntime
+   pip install onnx onnxruntime
 
 ONNX Runtime recommends using the latest stable runtime for PyTorch.