add torch to requirements.txt due to a PyTorch warning

None of PyTorch, TensorFlow >= 2.0, or Flax have been found. Models won't be available and only tokenizers, configuration and file/data utilities can be used.

adding version numbers for smolagent and other dependencies is something I need to look at shortly.

requirements.txt

@@ -8,4 +8,5 @@ opentelemetry-sdk
 opentelemetry-exporter-otlp
 openinference-instrumentation-smolagents
 biopython
-transformers
+transformers
+torch