Revert "Apply acc06bc fix also to pip upgrade"

This reverts commit 49f151f.

Author: Thomas Trevethan

ci/test/04_install.sh

@@ -11,7 +11,7 @@ if [[ $QEMU_USER_CMD == qemu-s390* ]]; then
 fi
 
 if [ "$CI_OS_NAME" == "macos" ]; then
-  sudo -H pip3 install --upgrade --break-system-packages pip
+  sudo -H pip3 install --upgrade pip
   # shellcheck disable=SC2086
   IN_GETOPT_BIN="$(brew --prefix gnu-getopt)/bin/getopt" ${CI_RETRY_EXE} pip3 install --user $PIP_PACKAGES
 fi