Linux Releases for Python: Update build process to use manylinux_2_28 instead of manylinux2014

[thomastrapp]

The docker image quay.io/pypa/manylinux2014_x86_64 has reached EOL on June 30th, 2024 [See pypa/manylinux].

Further, I expect that the new image manylinux_2_28 will fix the currently broken build process due to the outdated glibc on manylinux2014.

Background info on Github Actions and "manylinux":

• Github Actions, such as actions/checkout have requirements on the target system, such as a recent glibc and libstdc++ (actions/checkout and other actions apparently use a dynamically linked Node LTS version)
• The docker image manylinux2014_x86_64, which is currently used to build the static Linux releases, has an outdated glibc (on purpose -- The idea is to target a version that works on many Linux distributions, because glibc is downwards compatible) and other outdated system libraries, such as libstdc++.
• Hext's Linux releases for python are built with current versions of Github Actions, which now fails.

[thomastrapp]

This is fixed. Hext for Python now requires Glibc version ≥2.28 which was released in August of 2018.