ci: fix cache key issue #529

Job	Run time
windows / setup	56s
macos / setup (macos-13)	1m 20s
linux / setup (ubuntu-20.04)	41s
macos / setup (macos-latest)	34s
linux / setup (ubuntu-latest)	38s
linux / test (ubuntu-20.04, tcc)	2s
linux / test-sanitzed (gcc, address,leak,undefined,shift,shift-exponent,shift-base,integer-divide-by-zero...	4s
linux / test (ubuntu-20.04, gcc)	2s
linux / test-sanitzed (gcc, thread)	3s
linux / test (ubuntu-20.04, gcc, -W -cstrict)	2s
linux / test-sanitzed (clang, address,leak,undefined)	3s
linux / test (ubuntu-20.04, clang)	2s
linux / test-sanitzed (clang, thread)	3s
linux / test (ubuntu-20.04, clang, -W -cstrict)	2s
linux / test (ubuntu-latest, tcc)	3s
linux / test (ubuntu-latest, gcc)	2s
linux / lint / fmt	2s
linux / test (ubuntu-latest, gcc, -W -cstrict)	2s
linux / test (ubuntu-latest, clang)	3s
linux / lint / vet	2s
linux / test (ubuntu-latest, clang, -W -cstrict)	3s
linux / lint / check-md	3s
windows / test	1m 19s
windows / test (-W)	1m 19s
macos / test (macos-13, tcc)	31s
macos / test (macos-13, clang)	22s
macos / test (macos-13, clang, -W -cstrict)	21s
macos / test (macos-latest, tcc)	15s
macos / test (macos-latest, clang)	14s
macos / test (macos-latest, clang, -W -cstrict)	22s
	9m 35s

Provide feedback