ci: fix cache key issue #535

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Job	Run time
linux / setup (ubuntu-20.04)	46s
linux / setup (ubuntu-latest)	41s
macos / setup (macos-13)	1m 7s
macos / setup (macos-latest)	33s
windows / setup	54s
linux / test-sanitzed (gcc, address,leak,undefined,shift,shift-exponent,shift-base,integer-divide-by-zero...	20s
linux / test-sanitzed (gcc, thread)	13s
linux / test (ubuntu-20.04, tcc)	8s
linux / test-sanitzed (clang, address,leak,undefined)	16s
linux / test (ubuntu-20.04, gcc)	12s
linux / test-sanitzed (clang, thread)	15s
linux / test (ubuntu-20.04, gcc, -W -cstrict)	14s
linux / test (ubuntu-20.04, clang)	10s
linux / lint / fmt	3s
linux / test (ubuntu-20.04, clang, -W -cstrict)	21s
linux / test (ubuntu-latest, tcc)	4s
linux / test (ubuntu-latest, gcc)	11s
linux / lint / vet	3s
linux / test (ubuntu-latest, gcc, -W -cstrict)	12s
linux / lint / check-md	12s
linux / test (ubuntu-latest, clang)	10s
linux / test (ubuntu-latest, clang, -W -cstrict)	11s
windows / test	1m 25s
windows / test (-W)	48s
macos / test (macos-13, tcc)	20s
macos / test (macos-13, clang)	26s
macos / test (macos-13, clang, -W -cstrict)	26s
macos / test (macos-latest, tcc)	15s
macos / test (macos-latest, clang)	15s
macos / test (macos-latest, clang, -W -cstrict)	14s
	11m 25s

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