macOS installer is missing `pip` for free-threaded binaries

[colesbury]

Bug report

The official macOS installer, doesn't install pip for the free-threading binaries. Users need to run:

python3.13t -m ensurepip

And until the bundled pip is upgraded in #120888:

python3.13t -m pip install --upgrade pip

[ned-deily]

Thanks for the report. As a result, pip is now automatically installed to the free-threaded PythonT.framework for 3.13 when the Free-threaded Python option of the python.org installer for macOS is selected. The free-threaded installation option is now documented in the Using Python on macOS documentation