python: relax constraint on onnxruntime

With a past version of uv, `uv add onnxruntime` would fail. To address
that, we overly constrained the allowed onnxruntime version (#801).

More recent versions of uv have now fixed this
(astral-sh/uv#9827), so we remove the
constraint.

Fixes #835.

python/pyproject.toml

@@ -34,7 +34,7 @@ dynamic = ["version"]
 
 dependencies = [
     "click>=8.1.7",
-    "onnxruntime>=1.17.0,<1.20",
+    "onnxruntime>=1.17.0",
     "numpy>=1.24; python_version < '3.12'",
     "numpy>=1.26; python_version >= '3.12' and python_version < '3.13'",
     "numpy>=2.1.0; python_version >= '3.13'",