BUG: fix mtime of sdist archive members #532

Job	Run time
mypy	13s
msvc (3.11)	5m 31s
cygwin (3.9)	15m 50s
homebrew (3.8)	7m 51s
homebrew (3.11)	5m 12s
pyston (3.8)	2m 43s
test (ubuntu, 3.7)	2m 23s
test (ubuntu, 3.11)	2m 46s
test (macos, 3.7)	3m 18s
test (macos, 3.11)	6m 34s
test (windows, 3.7)	6m 58s
test (windows, 3.11)	7m 1s
test (ubuntu, pypy-3.9)	9m 2s
test (ubuntu, 3.8)	2m 29s
test (ubuntu, 3.9)	2m 59s
test (ubuntu, 3.10)	3m 3s
test (ubuntu, 3.12-dev)	3m 56s
test (ubuntu, 3.11, ~=0.63.3)	3m 18s
test (ubuntu, 3.11, ~=0.64.0)	3m 15s
test (ubuntu, 3.11, ~=1.0.0)	2m 15s
test (ubuntu, 3.11, ~=1.1.0)	2m 34s
test (ubuntu, 3.11, @git+https://github.com/mesonbuild/meson.git)	2m 27s
	1h 41m 38s

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