deps (ex/llm): Fixed perf<0.18 to be compatible with transformers==4.50.0 (#1421)

Author: nickfraser

requirements/requirements-llm.txt

@@ -8,6 +8,9 @@ onnx
 onnxruntime<1.21
 optimum[onnxruntime]
 pandas
+# TODO (nf): Remove when unpinning `transformers`
+# peft>=0.18 is incompatible with transformers==4.50.0
+peft<0.18
 # TODO (pml): Remove when unpinning `transformers`, as `lighteval>=0.10.0`
 # requires this dependency explicitely.
 # See https://github.com/huggingface/lighteval/commit/2651750480d9a23ab0153f8ed3ef1d3331a2ea88.