MAINT change licence metadata to be compliant with PEP 639 (skrub-data#1692)

Author: DimitriPapadopoulos

pyproject.toml

@@ -1,5 +1,5 @@
 [build-system]
-requires = ["setuptools>=64", "setuptools_scm[toml]>=8"]
+requires = ["setuptools>=77.0.3", "setuptools_scm[toml]>=8"]
 build-backend = "setuptools.build_meta"
 
 [project]
@@ -13,11 +13,12 @@ authors = [
     {name = "Vincent Maladiere"},
     {name = "Gael Varoquaux"},
 ]
+license = "BSD-3-Clause"
+license-files = ["LICENSE.txt"]
 classifiers = [
     "Development Status :: 5 - Production/Stable",
     "Environment :: Console",
     "Intended Audience :: Science/Research",
-    "License :: OSI Approved :: BSD License",
     "Operating System :: OS Independent",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",