ci: pin manylinux_2_28 and explicitly select python3.12 interpreter #14

Job	Run time
macos (x86_64-apple-darwin)	2m 42s
macos (aarch64-apple-darwin)	2m 31s
sdist	12s
windows (x86_64-pc-windows-msvc)	4m 52s
linux (x86_64-unknown-linux-gnu)	4m 12s
Smoke (local) windows-latest py3.12	34s
Publish to PyPI	0s
Smoke (registry) ${{ matrix.os }} py${{ matrix.python }}	-1s
Report registry smoke failure	0s
	15m 2s

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