build: bump default setup version to 2.4.2 #255

Job	Run time
linux / setup	13s
windows / setup	44s
macos / setup	23s
linux / test (gcc)	51s
linux / build-examples (gcc)	30s
linux / test (clang)	1m 16s
linux / build-examples (gcc, -W -cstrict)	27s
linux / build-examples (clang)	18s
linux / build-examples (clang, -W -cstrict)	26s
linux / lint / fmt	3s
linux / lint / vet	3s
macos / build-examples (clang)	12s
macos / build-examples (clang, -W -cstrict)	16s
windows / build-examples (gcc)	1m 26s
windows / build-examples (gcc, -W -cstrict)	1m 27s
	8m 35s

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