BUG: fix mtime of sdist archive members #530

Job	Run time
homebrew (3.8)	7m 50s
homebrew (3.11)	4m 42s
cygwin (3.9)	8m 5s
msvc (3.11)	5m 34s
pyston (3.8)	2m 33s
mypy	11s
test (ubuntu, 3.7)	1m 52s
test (ubuntu, 3.11)	2m 35s
test (macos, 3.7)	3m 13s
test (macos, 3.11)	4m 57s
test (windows, 3.7)	4m 31s
test (windows, 3.11)	5m 51s
test (ubuntu, pypy-3.9)	7m 52s
test (ubuntu, 3.8)	1m 49s
test (ubuntu, 3.9)	2m 7s
test (ubuntu, 3.10)	3m 7s
test (ubuntu, 3.12-dev)	3m 32s
test (ubuntu, 3.11, ~=0.63.3)	2m 9s
test (ubuntu, 3.11, ~=0.64.0)	2m 8s
test (ubuntu, 3.11, ~=1.0.0)	2m 47s
test (ubuntu, 3.11, ~=1.1.0)	2m 24s
test (ubuntu, 3.11, @git+https://github.com/mesonbuild/meson.git)	2m 58s
	1h 22m 47s

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