ci: drop support for 32-bit Python wheels on Linux and remove deprecated options

Author: ntamas

.github/workflows/build.yml

@@ -5,18 +5,13 @@ on: [push, pull_request]
 env:
   CIBW_ENVIRONMENT_PASS_LINUX: PYTEST_TIMEOUT
   CIBW_TEST_COMMAND: "cd {project} && pip install --prefer-binary '.[test]' && python -m pytest -v tests"
-  CIBW_SKIP: "cp36-* cp37-* cp38-* pp37-* pp38-*"
+  CIBW_SKIP: "cp38-* pp38-*"
   PYTEST_TIMEOUT: 60
 
 jobs:
   build_wheel_linux:
-    name: Build wheels on Linux (${{ matrix.wheel_arch }})
+    name: Build wheels on Linux (x86_64)
     runs-on: ubuntu-22.04
-    strategy:
-      fail-fast: false
-      matrix:
-        wheel_arch: [x86_64, i686]
-
     steps:
       - uses: actions/checkout@v4
         with:
@@ -27,22 +22,19 @@ jobs:
         uses: pypa/cibuildwheel@v3.0.0
         env:
           CIBW_BEFORE_BUILD: "yum install -y flex bison libxml2-devel zlib-devel cairo-devel && pip install -U cmake pip setuptools wheel && python setup.py build_c_core"
-          CIBW_BUILD: "*-manylinux_${{ matrix.wheel_arch }}"
+          CIBW_BUILD: "*-manylinux_x86_64"
           CIBW_ENABLE: pypy
-          # Skip tests for Python 3.10 onwards because SciPy does not have
-          # 32-bit wheels for Linux.
-          CIBW_TEST_SKIP: "cp310-manylinux_i686 cp311-manylinux_i686 cp312-manylinux_i686 cp313-manylinux_i686"
 
       - name: Build wheels (musllinux)
         uses: pypa/cibuildwheel@v3.0.0
         env:
           CIBW_BEFORE_BUILD: "apk add flex bison libxml2-dev zlib-dev cairo-dev && pip install -U cmake pip setuptools wheel && python setup.py build_c_core"
-          CIBW_BUILD: "*-musllinux_${{ matrix.wheel_arch }}"
+          CIBW_BUILD: "*-musllinux_x86_64"
           CIBW_TEST_COMMAND: "cd {project} && pip install --prefer-binary '.[test-musl]' && python -m pytest -v tests"
 
       - uses: actions/upload-artifact@v4
         with:
-          name: wheels-linux-${{ matrix.wheel_arch }}
+          name: wheels-linux-x86_64
           path: ./wheelhouse/*.whl
 
   build_wheel_linux_aarch64_manylinux: