[ci] Upgrade image in which linux are built to get newer gcc.
See https://github.com/pypa/manylinux: From manylinux2014 to manylinux_2_28. Requires pip 20.3.
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See https://github.com/pypa/manylinux: From manylinux2014 to manylinux_2_28. Requires pip 20.3.