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chore: Restrict the sdist to an allowlist and verify it in CI (#79) #166

Job	Run time
sdist (functional)	43s
windows (3.14)	1m 36s
linux (3.10)	43s
windows (3.12)	1m 32s
windows (3.13)	1m 42s
linux (3.14)	46s
floor (lowest-direct deps) (ubuntu-latest)	12s
linux (3.11)	47s
floor (lowest-direct deps) (windows-latest)	1m 20s
linux (3.12)	46s
windows (3.11)	1m 39s
windows (3.10)	1m 35s
linux (3.13)	42s
	14m 3s