refactor: use oldest-supported-numpy

This code is currently hand-copied from SciPy, now there's a package that exists to do just that. As a bonus, NumPy will no longer need to build wheels on 3.10 (Linux 64-bit only currently)

Author: henryiii

pyproject.toml

@@ -5,17 +5,9 @@ requires = [
     "setuptools>=51.0.0",
     "wheel",
     "Cython>=0.29.21,<3",  # Note: sync with setup.py
-    # Numpy requirements for different OS/architectures
-    # Copied from https://github.com/scipy/scipy/blob/master/pyproject.toml (which is also licensed under BSD)
-    "numpy==1.17.3; python_version=='3.7' and (platform_machine!='arm64' or platform_system!='Darwin') and platform_machine!='aarch64'",
-    "numpy==1.18.3; python_version=='3.8' and (platform_machine!='arm64' or platform_system!='Darwin') and platform_machine!='aarch64'",
-    "numpy==1.19.3; python_version>='3.9' and (platform_machine!='arm64' or platform_system!='Darwin') and platform_machine!='aarch64'",
-    # Aarch64(Python 3.9 requirements are the same as AMD64)
-    "numpy==1.19.2; python_version=='3.7' and platform_machine=='aarch64'",
-    "numpy==1.19.2; python_version=='3.8' and platform_machine=='aarch64'",
-    # Darwin Arm64
-    "numpy>=1.20.0; python_version=='3.8' and platform_machine=='arm64' and platform_system=='Darwin'",
-    "numpy>=1.20.0; python_version=='3.9' and platform_machine=='arm64' and platform_system=='Darwin'"
+    # Numpy requirements for different OS/architectures, see
+    # https://github.com/scipy/oldest-supported-numpy/blob/master/setup.cfg
+    "oldest-supported-numpy",
 ]
 # uncomment to enable pep517 after versioneer problem is fixed.
 # https://github.com/python-versioneer/python-versioneer/issues/193