ci: fix cache key issue #531

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Job	Run time
windows / setup	1m 20s
linux / setup (ubuntu-20.04)	46s
macos / setup (macos-13)	1m 4s
linux / setup (ubuntu-latest)	58s
macos / setup (macos-latest)	33s
linux / test-sanitzed (gcc, address,leak,undefined,shift,shift-exponent,shift-base,integer-divide-by-zero...	2s
linux / test (ubuntu-20.04, tcc)	8s
linux / test-sanitzed (gcc, thread)	2s
linux / test (ubuntu-20.04, gcc)	16s
linux / test-sanitzed (clang, address,leak,undefined)	3s
linux / test (ubuntu-20.04, gcc, -W -cstrict)	15s
linux / test-sanitzed (clang, thread)	1s
linux / test (ubuntu-20.04, clang)	18s
linux / test (ubuntu-20.04, clang, -W -cstrict)	17s
linux / test (ubuntu-latest, tcc)	6s
linux / test (ubuntu-latest, gcc)	13s
linux / test (ubuntu-latest, gcc, -W -cstrict)	13s
linux / test (ubuntu-latest, clang)	10s
linux / lint / fmt	8s
linux / lint / check-md	2s
linux / test (ubuntu-latest, clang, -W -cstrict)	16s
linux / lint / vet	6s
macos / test (macos-13, tcc)	35s
macos / test (macos-13, clang)	37s
macos / test (macos-13, clang, -W -cstrict)	19s
macos / test (macos-latest, tcc)	15s
macos / test (macos-latest, clang)	12s
macos / test (macos-latest, clang, -W -cstrict)	20s
windows / test	1m 25s
windows / test (-W)	57s
	11m 57s

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