pyproject.toml: Move metadata here from setup.py

pyproject.toml

@@ -6,3 +6,20 @@ requires = ["setuptools",
 # Hence we declare a custom build backend.
 build-backend = "_custom_build_meta"  # just re-exports setuptools.build_meta definitions
 backend-path = ["."]
+
+[project]
+name = "cypari2"
+version = "2.1.4"
+description = "A Python interface to the number theory library PARI/GP"
+authors = [
+    {name = "Luca De Feo, Vincent Delecroix, Jeroen Demeyer, Vincent Klein", email = "sage-devel@googlegroups.com"},
+]
+dependencies = [
+    "cysignals>=1.7",
+]
+readme = "README.md"
+license = {text = "GNU General Public License, version 2 or later"}
+keywords = ["PARI/GP number theory"]
+
+[project.urls]
+Homepage = "https://github.com/sagemath/cypari2"

setup.py

@@ -58,25 +58,8 @@ def run(self):
         raise DistutilsOptionError("The package cypari2 will not function correctly when built as egg. Therefore, it cannot be installed using 'python setup.py install' or 'easy_install'. Instead, use 'pip install' to install cypari2.")
 
 
-with open('README.rst') as f:
-    README = f.read()
-
-with open('VERSION') as f:
-    VERSION = f.read().strip()
-
-
 setup(
-    name='cypari2',
-    version=VERSION,
-    install_requires=['cysignals>=1.7'],
-    description="A Python interface to the number theory library PARI/GP",
-    long_description=README,
-    url="https://github.com/sagemath/cypari2",
-    author="Luca De Feo, Vincent Delecroix, Jeroen Demeyer, Vincent Klein",
-    author_email="sage-devel@googlegroups.com",
-    license='GNU General Public License, version 2 or later',
     ext_modules=[Extension("*", ["cypari2/*.pyx"], **ext_kwds)],
-    keywords='PARI/GP number theory',
     packages=['cypari2'],
     package_dir={'cypari2': 'cypari2'},
     package_data={'cypari2': ['declinl.pxi', '*.pxd', '*.h']},