Use of unsafe PyTorch save

[ways]

$ bandit --recursive --ini .bandit.ini bris
Test results:
>> Issue: [B614:pytorch_load_save] Use of unsafe PyTorch load or save
   Severity: Medium   Confidence: High
   CWE: CWE-502 (https://cwe.mitre.org/data/definitions/502.html)
   More Info: https://bandit.readthedocs.io/en/1.8.2/plugins/b614_pytorch_load_save.html
   Location: bris/callbacks.py:103:12
102	
103	            torch.save(model, inference_checkpoint_filepath)

[ways]

From 33cde6d

[ways]

A safe alternative is to use torch.load with the safetensors library from hugingface, which provides a safe deserialization mechanism.

Is this something you consider important to fix, @tnipen ?

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Waiting for #17 to ease testing