Build against numpy 1.25.1, not oldest-supported-numpy

Numpy 1.25 is now backwards-compatible with previous API versions,
so oldest-supported-numpy is no longer necessary.

See https://numpy.org/doc/stable/release/1.25.0-notes.html#compiling-against-the-numpy-c-api-is-now-backwards-compatible-by-default

pyproject.toml

@@ -3,9 +3,7 @@ build-backend = 'setuptools.build_meta'
 requires = ["setuptools>=61",
             "setuptools_scm[toml]>=6.2",
             "wheel",
-            # see https://github.com/scipy/oldest-supported-numpy/issues/62
-            "numpy==1.19.0; python_version<='3.8' and platform_system=='Windows' and platform_python_implementation != 'PyPy'",
-            "oldest-supported-numpy; python_version>'3.8' or platform_system!='Windows' or platform_python_implementation == 'PyPy'"]
+            "numpy==1.25.1"]
 
 [project]
 name = "radbelt"
@@ -28,7 +26,7 @@ classifiers = [
 ]
 license = { text = "NOSA" }
 requires-python = ">=3.9"
-dependencies = ["astropy", "numpy"]
+dependencies = ["astropy", "numpy>=1.19"]
 dynamic = [ "version" ]
 
 [project.urls]

setup.py

@@ -8,7 +8,8 @@
                 'radbelt/core.f',
                 'radbelt/extern/igrf/shellig.f',
                 'radbelt/extern/aep8/trmfun.f'
-            ]
+            ],
+            define_macros=[('NPY_NO_DEPRECATED_API', 'NPY_1_19_API_VERSION')]
         )
     ]
 )