[3208956565] Upstream Reporter: Christian Heimes
Upstream description:

The `project_override` feature to patch `pyproject.toml` breaks when a requirement is listed multiple times.

1. 1. Example

`opencv-python-headless 4.12.0.88` has `build-system.requires`

```yaml
requires = [
"numpy<2.0; python_version<'3.9'",
"numpy==2.0.2; python_version>='3.9' and python_version<'3.13'",
"numpy==2.1.3; python_version=='3.13'",
"packaging",
"pip",
"scikit-build>=0.14.0",
"setuptools==59.2.0; python_version<'3.12'",
"setuptools<70.0.0; python_version>='3.12'",
]
```

Fromager modifies this to:

```yaml
requires = ["numpy==2.1.3; python_version == "3.13"", "packaging", "pip", "scikit-build>=0.14.0", "setuptools"]
```

Note that the `numpy` pins for Python < 3.9 and for Python 3.9 to <3.13 have been removed.