ci: fix cache key issue #530

Job	Run time
windows / setup	1m 27s
linux / setup (ubuntu-20.04)	53s
macos / setup (macos-13)	1m 31s
linux / setup (ubuntu-latest)	41s
macos / setup (macos-latest)	31s
linux / test (ubuntu-20.04, tcc)	5s
linux / test-sanitzed (gcc, address,leak,undefined,shift,shift-exponent,shift-base,integer-divide-by-zero...	2s
linux / test (ubuntu-20.04, gcc)	19s
linux / test-sanitzed (gcc, thread)	2s
linux / test (ubuntu-20.04, gcc, -W -cstrict)	15s
linux / test-sanitzed (clang, address,leak,undefined)	1s
linux / test (ubuntu-20.04, clang)	14s
linux / test-sanitzed (clang, thread)	3s
linux / test (ubuntu-20.04, clang, -W -cstrict)	17s
linux / test (ubuntu-latest, tcc)	4s
linux / lint / check-md	4s
linux / lint / fmt	3s
linux / test (ubuntu-latest, gcc)	19s
linux / test (ubuntu-latest, gcc, -W -cstrict)	15s
linux / lint / vet	1s
linux / test (ubuntu-latest, clang)	10s
linux / test (ubuntu-latest, clang, -W -cstrict)	16s
macos / test (macos-13, tcc)	22s
macos / test (macos-13, clang)	23s
macos / test (macos-13, clang, -W -cstrict)	25s
macos / test (macos-latest, tcc)	19s
macos / test (macos-latest, clang)	16s
macos / test (macos-latest, clang, -W -cstrict)	12s
windows / test	37s
windows / test (-W)	49s
	10m 56s

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