cix: fix artifact name for sdist #431

Job	Run time
C++ Benchmark (ubuntu-latest)	33s
Lint (3.9)	34s
Unit tests (ubuntu-latest, 3.8)	25s
Unit tests (ubuntu-latest, 3.9)	28s
Unit tests (ubuntu-latest, 3.10)	30s
Unit tests (ubuntu-latest, 3.11)	30s
Unit tests (ubuntu-latest, 3.12)	30s
Unit tests (ubuntu-latest, 3.13-dev)	38s
Unit tests (ubuntu-latest, pypy-3.8)	35s
Unit tests (ubuntu-latest, pypy-3.9)	35s
Unit tests (ubuntu-latest, pypy-3.10)	41s
Unit tests (windows-latest, 3.8)	1m 13s
Unit tests (windows-latest, 3.9)	1m 11s
Unit tests (windows-latest, 3.10)	1m 15s
Unit tests (windows-latest, 3.11)	1m 7s
Unit tests (windows-latest, 3.12)	1m 33s
Unit tests (windows-latest, 3.13-dev)	2m 20s
Unit tests (windows-latest, pypy-3.8)	1m 26s
Unit tests (windows-latest, pypy-3.9)	1m 18s
Unit tests (windows-latest, pypy-3.10)	1m 19s
Unit tests (macos-latest, 3.10)	38s
Unit tests (macos-latest, 3.11)	36s
Unit tests (macos-latest, 3.12)	41s
Unit tests (macos-latest, 3.13-dev)	50s
Unit tests (macos-latest, pypy-3.9)	59s
Unit tests (macos-latest, pypy-3.10)	43s
	23m 8s

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