fix: requirements.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-ONNX-7231121

requirements.txt

@@ -14,7 +14,7 @@ torchmetrics==0.8
 hydra-core>=1.2.0
 onnxruntime>=1.15.0
 # onnx 1.16.0 introduce IR 10 which is not yet supported by onnx runtime & graphsurgeon
-onnx==1.15.0
+onnx==1.16.2
 pillow>=10.2.0
 pip-tools>=6.12.1
 einops==0.3.2