Upgrade python-casacore wheels to manylinux_2_28

[sjperkins]

I've raised this here because the base docker images for building wheels appear to maintained in casacore/casacore

Quoting https://github.com/pypa/manylinux/blob/409125c00c29b4a6ecf5ff5f32129823165780a8/README.rst#L21-L46

PEP 599 defines the following platform tags:

• manylinux2014_x86_64
  ...

Wheels are built on CentOS 7 which will reach End of Life (EOL) on June 30th, 2024.

PEP 600 has been designed to be "future-proof" and does not enforce specific symbols and a specific distro to build. It only states that a wheel tagged manylinux_x_y shall work on any distro based on glibc>=x.y. The manylinux project supports:

• manylinux_2_24 images for x86_64, i686, aarch64, ppc64le and s390x.
• manylinux_2_28 images for x86_64, aarch64, ppc64le and s390x.

AFAIK manylinux_2_24 is already deprecated, so manylinux_2_28 looks like the way forward. Note that manylinux2014 compiles wheels using the old C++ ABI _GLIBCXX_USE_CXX11_ABI=0, while manylinux_2_28 wheels are compiled with _GLIBCXX_USE_CXX11_ABI=1

I'm linking this related issue, for informational purposes only as I'll be working around it on my side:

• Importing both python-casacore and arcae extension modules results in symbol clashes ratt-ru/arcae#72