Force pip to install aqt

.ci/macos/build.sh

@@ -9,7 +9,8 @@ set -ue
 QT_BASEPATH=(${HOME}/Qt/6.*/macos/)
 PATH="${QT_BASEPATH}/bin/:${PATH}"
 pipx ensurepath
-. ~/.zshrc
+# TODO: this breaks on Cirrus, so it's commented out for now
+# . ~/.zshrc
 export PATH
 
 CMAKE_PREFIX_PATH="${QT_BASEPATH}/lib/cmake"

.cirrus.yml

@@ -10,7 +10,7 @@ task:
     - unset HOMEBREW_NO_AUTO_UPDATE
     - brew bundle --file .ci/macos/Brewfile
   aqt_script:
-    - pip3 install aqtinstall
+    - pip3 install --break-system-packages aqtinstall
     - mkdir $HOME/Qt
     - aqt install-qt --outputdir $HOME/qt mac desktop 6.6 clang_64 -m qtlocation qtimageformats qtmultimedia qtpositioning qtshadertools
   build_script: