[WIP DO NOT MERGE] Use DeepStream 7.1

[idantene]

While work on integrating DS8.0 is underway, it would be beneficial to at least upgrade Savant to DS7.1 and allow more modern TensorRT (10.3) in current workflows. Worth noting that TRT 10.3 (and DS7.1) are the latest support for Orin devices, as per the support matrix here.

I'm not sure what else may need to be updated other than this small image tweak.
The release notes seem to be mostly subtle changes, with a few new bindings available and an update to pybind11 to v2.13.0.