Dependabot update CLA: trivial (deps): Bump actions/download-artifact from 3 to 4 #4

Job	Run time
cygwin (windows-2019, win64, -DCMAKE_C_COMPILER=gcc --strict-warnings enable-demos no-fips)	35m 27s
minimal (windows-2019)	9m 39s
minimal (windows-2022)	9m 9s
shared (windows-2019, win64, enable-fips)	30m 15s
plain (windows-2019)	17m 52s
shared (windows-2019, win32, --strict-warnings no-fips)	29m 21s
plain (windows-2022)	18m 2s
shared (windows-2022, win64, enable-fips)	27m 34s
shared (windows-2022, win32, --strict-warnings no-fips)	29m 11s
	3h 26m 30s

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