fix: use old license text

Before moving to scikit-build-core, this was the contents of the `License` field. Putting the entire contents of the license file here breaks `importlib.metadata.metadata`, and isn't needed - the license file is stored in the wheel already, and the currently only canonical location for license metadata is the trove classifiers. PEP 639, which is currently provisionally accepted and waiting support in packaging, PyPI, etc, solves this by supporting SPDX license expressions. But that's not ready yet.

pyproject.toml

@@ -9,7 +9,7 @@ version = "2.30.1"
 maintainers = [{ name = "Hans Dembinski", email = "[email protected]" }]
 readme = "README.rst"
 requires-python = ">=3.9"
-license = { file = "LICENSE" }
+license = { text = "MIT+LGPL" }
 classifiers = [
     "Development Status :: 5 - Production/Stable",
     "Intended Audience :: Science/Research",