ci, macos: Use --break-system-packages with Homebrew's python

Homebrew's python@3.12 is marked as externally managed (PEP 668),
necessitating different approaches for installing Python packages.

For more details, please refer to https://github.com/orgs/Homebrew/discussions/3404.

Github-Pull: bitcoin#29610
Rebased-From: acc06bc

ci/test/00_setup_env_mac_native.sh

@@ -7,7 +7,9 @@
 export LC_ALL=C.UTF-8
 
 export HOST=x86_64-apple-darwin
-export PIP_PACKAGES="zmq"
+# Homebrew's python@3.12 is marked as externally managed (PEP 668).
+# Therefore, `--break-system-packages` is needed.
+export PIP_PACKAGES="--break-system-packages zmq"
 export GOAL="install"
 # -Wno-error=deprecated-declarations is to disable errors for deprecation warnings:
 # "'NSUserNotificationCenter' is deprecated: first deprecated in macOS 11.0".