maint: bump max Cython version and add pypy wheels

.github/workflows/buildwheel.yml

@@ -42,7 +42,7 @@ jobs:
         if: ${{ matrix.os == 'windows-2019' }}
 
       - name: Build wheels
-        uses: pypa/[email protected].3
+        uses: pypa/cibuildwheel@d04cacbc9866d432033b1d09142936e6a0e2121a # v2.23.2
         env:
           # override setting in pyproject.toml to use msys2 instead of msys64 bash
           CIBW_BEFORE_ALL_WINDOWS: msys2 -c bin/cibw_before_all_windows.sh
@@ -86,12 +86,13 @@ jobs:
         os: [ubuntu-24.04, ubuntu-24.04-arm, windows-2019, macos-13, macos-14]
         # This list to be kept in sync with cibuildwheel config
         # and python-requires in pyproject.toml.
-        python-version: ['3.11', '3.12', '3.13', '3.13t'] # , 'pypy3.10']
+        python-version: ['3.11', '3.12', '3.13', '3.13t', 'pypy3.11']
 
     steps:
       - uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
+          allow-prereleases: true
       - uses: actions/download-artifact@v4
         with:
           name: wheels-${{ matrix.os }}

meson.build

@@ -14,7 +14,7 @@ project(
 flint_lower = '>=3.0'
 flint_upper = '<3.3'
 cython_lower = '>=3.0.11'
-cython_upper = '<=3.1.0a1'
+cython_upper = '<3.2'
 
 py = import('python').find_installation(pure: false)
 dep_py = py.dependency()

pyproject.toml

@@ -28,16 +28,16 @@ content-type = "text/markdown"
 # Minimum build requirements tested in CI need to be kept in sync with the
 # versions in requires below so that they are tested.
 #
-# To support the freethreaded build (CPython 3.13t) the alpha release 3.1.0a1
-# of Cython is needed as a minimum requirement. It is possible that future
-# versions of Cython might still work but typically a Cython release breaks
-# something in the build of python-flint so we pin the exact version here.
+# To support the freethreaded build (CPython 3.13t) version 3.1.0 of Cython is
+# needed as a minimum requirement. It is possible that future versions of
+# Cython might still work but typically a Cython release breaks something in
+# the build of python-flint so we include an upper bound here.
 #
 # Apart from the freethreading build any Cython version from 3.0.11 onwards is
 # fine. It is not possible to have a separate version constraint here for the
 # freethreading build only though.
 #
-requires = ["meson-python>=0.13", "cython==3.1.0a1"]
+requires = ["meson-python >= 0.13", "cython >=3.1,<3.2"]
 build-backend = "mesonpy"
 
 [tool.cython-lint]
@@ -82,7 +82,7 @@ package = "flint"
 [tool.cibuildwheel]
 # requires-python needs to keep in sync with this and also the list of Python
 # versions the wheels are tested against in CI.
-build = "cp311-* cp312-* cp313-* cp313t-*" # pp311-*"
+build = "cp311-* cp312-* cp313-* cp313t-* pp311-*"
 skip = "*-win32 *-manylinux_i686 *-musllinux_*"
 
 # Enable building for free-threaded CPython builds