Let us try to install libunwind on its own rather than with llvm

.github/workflows/testing_wheels.yml

@@ -37,12 +37,11 @@ jobs:
             cibw:
               build: "cp39-win_amd64 cp310-win_amd64 cp311-win_amd64 cp312-win_amd64"
     env:
-      MACOSX_DEPLOYMENT_TARGET: "12.0"
       CIBW_BUILD: "${{ matrix.cibw.build || '*' }}"
       CIBW_SKIP: "*musllinux*"
       CIBW_ARCHS: "${{ matrix.cibw.arch || 'auto' }}"
       CIBW_MANYLINUX_X86_64_IMAGE: "${{ matrix.cibw.manylinux_image }}"
-      CIBW_BEFORE_BUILD_MACOS: "brew install libomp llvm && brew link --overwrite [email protected] && brew link --force libomp"
+      CIBW_BEFORE_BUILD_MACOS: "brew install libomp libunwind && brew link --overwrite [email protected] && brew link --force libomp && brew link --force libunwind"
       CIBW_REPAIR_WHEEL_COMMAND_MACOS: "delocate-listdeps {wheel} && delocate-wheel --verbose --require-archs {delocate_archs} -w {dest_dir} {wheel}"
       # to install latest delocate package
       CIBW_DEPENDENCY_VERSIONS: "latest"