CI: update macOS workflow

- Suppress colcon desktop notification error.

Signed-off-by: Rhys Mainwaring <rhys.mainwaring@me.com>

.github/scripts/macos_build.sh

@@ -16,4 +16,4 @@ export PATH=$PATH:$HOME/Library/Python/3.11/bin:$HOME/Library/Python/3.12/bin
 # Use desktop_notification- to suppress error:
 #   ERROR:colcon.colcon_notification.desktop_notification.terminal_notifier:
 #   Could not find the colcon-terminal-notifier.app in the install prefix '/Users/runner/Library/Python/3.12'
-colcon build --symlink-install --merge-install --cmake-args -DCMAKE_BUILD_TYPE=RelWithDebInfo -DBUILD_TESTING=ON -DCMAKE_CXX_STANDARD=17 -DCMAKE_MACOSX_RPATH=FALSE -DCMAKE_INSTALL_NAME_DIR=$(pwd)/install/lib desktop_notification-
+colcon build --symlink-install --merge-install --cmake-args -DCMAKE_BUILD_TYPE=RelWithDebInfo -DBUILD_TESTING=ON -DCMAKE_CXX_STANDARD=17 -DCMAKE_MACOSX_RPATH=FALSE -DCMAKE_INSTALL_NAME_DIR=$(pwd)/install/lib --event-handlers desktop_notification-