Update license declarations

Per https://packaging.python.org/en/latest/guides/writing-pyproject-toml/#license
Requires increasing minimum setuptools version

Author: jjaderberg

python-wrapper/pyproject.toml

@@ -1,5 +1,5 @@
 [build-system]
-requires = ["setuptools>=61.0.0", "wheel"]
+requires = ["setuptools>=77.0.3", "wheel"]
 build-backend = "setuptools.build_meta"
 
 [project]
@@ -8,12 +8,12 @@ version = "0.5.1"
 description = "A simple graph visualization tool"
 readme = "README.md"
 authors = [{ name = "Neo4j", email = "team-gds@neo4j.org" }]
-license = { file = "LICENSE" }
+license = "GPL-3.0-only"
+license-files = [ "LICENSE" ]
 classifiers = [
     "Development Status :: 3 - Alpha",
     "Intended Audience :: Developers",
     "Intended Audience :: Science/Research",
-    "License :: OSI Approved :: GNU General Public License v3 (GPLv3)",
     "Operating System :: OS Independent",
     "Programming Language :: Python",
     "Programming Language :: Python :: 3",