Update python_requires (#27354)
### Description
The requires-python field in the
[metadata](https://pypi.org/pypi/onnxruntime/json) is currently set to
`python >= 3.10`. However, since ONNX Runtime has dropped support for
`Python 3.10`, this constraint is now inaccurate and may lead to
dependency resolution issues in `uv lock`.
Related Commits: #26397
