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Moving linux builds to GLIBC==2.28

A short note for visibility.

PyPy builds tarballs of the python interpreter ready for download. These include the latest releases and also nightly builds, fresh from our fleet of buildbots. Over the next couple of days, the nightly builds on linux will transition from manylinux2014 based docker images to manylinux2_28 images. The practical implication is that nightly images, and the next releases, will require a minimum of GLIBC>=2.28, i.e. AlmaLinux8, amanzonlinux 2023, debian 10, ubuntu 20.04. For a good overview of how this glibc/distro/manylinux all works, see the PEP 600 compliance page.

The next release will indicate this change by a new PyPy major version, 8.0.0. It should include a Python3.12 interpreter, in which case it will be the last release of the Python 3.11 interpreter.

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