Support numpy 2.0

Per numpy's instructions, build with numpy >= 1.25 and test with numpy
1.19.

.github/workflows/build_wheels.yaml

@@ -20,7 +20,7 @@ env:
 
 jobs:
   build_wheels:
-    name: Build wheels [${{ matrix.python }}, ${{ matrix.os.base }}-${{ matrix.os.arch }}]
+    name: Build wheels [${{ matrix.python.version }}, ${{ matrix.os.base }}-${{ matrix.os.arch }}]
     runs-on: ${{ matrix.os.base }}-${{ matrix.os.version }}
     strategy:
       fail-fast: false
@@ -39,19 +39,28 @@ jobs:
           version: 13
           arch: 'x86_64'
 
-        python: ['cp38', 'cp39', 'cp310', 'cp311', 'cp312']
+        python:
+        - version: 'cp39'
+          oldest_numpy: '1.21.6'
+        - version: 'cp310'
+          oldest_numpy: '1.21.6'
+        - version: 'cp311'
+          oldest_numpy: '1.23.2'
+        - version: 'cp312'
+          oldest_numpy: '1.26.2'
 
     steps:
       - uses: actions/[email protected]
 
       - name: Build wheels
         uses: pypa/[email protected]
         env:
-          CIBW_BUILD: "${{ matrix.python }}-*"
+          CIBW_BUILD: "${{ matrix.python.version }}-*"
+          CIBW_TEST_REQUIRES: pytest==8.2.1 numpy==${{ matrix.python.oldest_numpy }}
 
       - uses: actions/[email protected]
         with:
-          name: dist-python-${{ matrix.python }}-${{ matrix.os.base }}-${{ matrix.os.arch }}
+          name: dist-python-${{ matrix.python.version }}-${{ matrix.os.base }}-${{ matrix.os.arch }}
           path: ./wheelhouse/*.whl
 
   build_sdist:

INSTALLING.rst

@@ -109,9 +109,9 @@ Install prerequisites
 
 **General requirements:**
 
-* **C compiler** (tested with gcc 9-12, clang 10-14, visual studio 2019-2022)
-* **Python** >= 3.8
-* **numpy** >= 1.17.3
+* **C compiler** (tested with gcc 10-14, clang 10-18, Visual Studio 2019-2022)
+* **Python** >= 3.9
+* **numpy** >= 1.19.0
 * **Cython** >= 0.22
 
 **To build the documentation**:

pyproject.toml

@@ -17,7 +17,7 @@ classifiers=[
     "License :: OSI Approved :: BSD License",
     "Topic :: Scientific/Engineering :: Physics",
     ]
-dependencies = ["numpy>=1.9.3"]
+dependencies = ["numpy>=1.19.0"]
 
 [project.scripts]
 gsd = "gsd.__main__:main"
@@ -36,12 +36,11 @@ packages = ["gsd", "gsd.test"]
 requires = ["setuptools>=64.0.0",
             "wheel",
             "Cython",
-            "oldest-supported-numpy"]
+            "numpy>=2.0.0rc1"]
 
 [tool.cibuildwheel]
 # Test the wheels.
 test-command = "pytest --pyargs gsd -v --log-level=DEBUG"
-test-requires = "pytest"
 
 # Build on 64-bit architectures.
 archs = ["auto64"]