ENH: do not include uncommitted changes in the sdist #2411

Job	Run time
msvc (3.11)	1m 28s
cygwin (3.9)	1m 28s
homebrew (3.8)	1m 37s
mypy	12s
homebrew (3.11)	1m 37s
pyston (3.8)	1m 18s
test (ubuntu, 3.7)	1s
test (ubuntu, 3.12)	1m 8s
test (macos, 3.7)	1m 56s
test (macos, 3.12)	59s
test (windows, 3.7)	1s
test (windows, 3.12)	1s
test (ubuntu, pypy-3.9)	1s
test (ubuntu, pypy-3.10)	1s
test (ubuntu, 3.8)	1s
test (ubuntu, 3.9)	1s
test (ubuntu, 3.10)	1m 48s
test (ubuntu, 3.11, ~=0.63.3)	1m 47s
test (ubuntu, 3.11, ~=0.64.0)	1m 37s
test (ubuntu, 3.11, ~=1.0.0)	1m 48s
test (ubuntu, 3.11, ~=1.1.0)	1m 11s
test (ubuntu, 3.12, ~=1.2.3)	1s
test (ubuntu, 3.12, ~=1.3)	1s
test (ubuntu, 3.12, @git+https://github.com/mesonbuild/meson.git)	1s
test (windows, 3.12, @git+https://github.com/mesonbuild/meson.git)	1s
test (ubuntu, 3.12, ==0.7.1)	53s
	20m 58s

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