Switch to downloading prebuilt release artifacts instead of a submodule

scripts/generate-dmg.sh

@@ -31,6 +31,9 @@ fi
 
 [ "$SIGNING_IDENTITY" == "" ] || git diff-index --quiet HEAD -- || fail "Signed release builds must not have unstaged changes!"
 
+echo Updating dependencies
+python3 $SOURCE_ROOT/setup-deps.py
+
 echo Cleaning output directories
 rm -rf $BUILD_FOLDER
 rm -rf $INSTALLER_FOLDER