DEV: remove universal wheels

.github/workflows/release.yml

@@ -22,12 +22,6 @@ jobs:
         - os: macos-14
           platform_id: macosx_arm64
 
-        # MacOS universal2 (not necessary, but matching
-        # those available to download on iqtree.org)
-        - os: macos-14
-          platform_id: macosx_universal2
-
-
     steps:
       - uses: "actions/checkout@v4"
         with:
@@ -46,11 +40,9 @@ jobs:
           CIBW_BEFORE_ALL_LINUX: ./build_tools/before_all_linux.sh
           CIBW_BEFORE_ALL_MACOS: ./build_tools/before_all_mac.sh
           CIBW_ARCHS_LINUX: ${{endsWith(matrix.platform_id, '_x86_64') && 'x86_64' || 'aarch64'}} 
-          CIBW_ARCHS_MACOS: ${{endsWith(matrix.platform_id, 'universal2') && 'universal2' || 'auto'}} 
           CIBW_BUILD: "*${{matrix.platform_id}}"
           CIBW_TEST_REQUIRES: pytest
           CIBW_TEST_COMMAND: pytest {package}/tests
-          CIBW_TEST_SKIP: "*-macosx_universal2:x86_64" # skip x86 on m1 mac
           CIBW_SKIP: pp* # Disable building PyPy wheels on all platforms
 
       - name: Upload wheels