pyproject: define [project]

It seems this is the way now. Various tools are complaining about us
not having this.

We port some of the metadata over from setup.py. This should be
backwards compatible.

Author: indygreg

docs/news.rst

@@ -53,6 +53,7 @@ Changes
 
 * We now use a non-rc version of cffi 1.17 on all Python versions. Python
   <=3.12 have cffi upgraded from cffi 1.16 -> 1.17.
+ * The `pyproject.toml` file now defines a `[project]` section.
 
 0.23.0 (released 2024-07-14)
 ============================

pyproject.toml

@@ -1,3 +1,31 @@
+[project]
+name = "zstandard"
+dynamic = ["version"]
+description = "Zstandard bindings for Python"
+readme = { file = "README.rst", content-type = "text/x-rst" }
+authors = [
+    { name = "Gregory Szorc", email = "[email protected]" },
+]
+license = { text = "BSD" }
+requires-python = ">=3.8"
+classifiers = [
+    "Development Status :: 5 - Production/Stable",
+    "Intended Audience :: Developers",
+    "License :: OSI Approved :: BSD License",
+    "Programming Language :: C",
+    "Programming Language :: Python :: 3.8",
+    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
+]
+keywords = ["zstandard", "zstd", "compression"]
+
+[project.urls]
+Homepage = "https://github.com/indygreg/python-zstandard"
+Documentation = "https://python-zstandard.readthedocs.io/en/latest/"
+
 [build-system]
 requires = [
     "cffi>=1.17.0",

setup.py

@@ -132,26 +132,6 @@
 setup(
     name="zstandard",
     version=version,
-    description="Zstandard bindings for Python",
-    long_description=open("README.rst", "r").read(),
-    url="https://github.com/indygreg/python-zstandard",
-    author="Gregory Szorc",
-    author_email="[email protected]",
-    license="BSD",
-    python_requires=">=3.8",
-    classifiers=[
-        "Development Status :: 5 - Production/Stable",
-        "Intended Audience :: Developers",
-        "License :: OSI Approved :: BSD License",
-        "Programming Language :: C",
-        "Programming Language :: Python :: 3.8",
-        "Programming Language :: Python :: 3.9",
-        "Programming Language :: Python :: 3.10",
-        "Programming Language :: Python :: 3.11",
-        "Programming Language :: Python :: 3.12",
-        "Programming Language :: Python :: 3.13",
-    ],
-    keywords=["zstandard", "zstd", "compression"],
     packages=["zstandard"],
     package_data={"zstandard": ["__init__.pyi", "py.typed"]},
     ext_modules=extensions,