macos wheel building: explicitly install icu4c and libxml2

Author: proycon

.cirrus.yml

@@ -18,7 +18,7 @@ cirrus_wheels_macos_arm64_task:
   install_cibuildwheel_script:
     - python -m pip install cibuildwheel
   run_cibuildwheel_script:
-    - CIBW_BUILD_VERBOSITY=3 CIBW_SKIP="*-win32 *-manylinux_* *-musllinux_*" CIBW_ARCHS_MACOS="arm64" CIBW_BUILD="cp39-* cp310-* cp311-*" CIBW_BEFORE_ALL_MACOS="brew tap fbkarsdorp/homebrew-lamachine && brew install frog" cibuildwheel --platform macos
+    - CIBW_BUILD_VERBOSITY=3 CIBW_SKIP="*-win32 *-manylinux_* *-musllinux_*" CIBW_ARCHS_MACOS="arm64" CIBW_BUILD="cp39-* cp310-* cp311-*" CIBW_BEFORE_ALL_MACOS="brew tap fbkarsdorp/homebrew-lamachine && brew install icu4c libxml2 frog" cibuildwheel --platform macos
   wheels_artifacts:
     path: "wheelhouse/*"