Bump julia-actions/setup-julia from 2 to 3 #324

Job	Run time
test (min, default, macOS-latest)	2m 6s
test (min, x86, windows-latest)	4m 38s
test (pre, default, ubuntu-latest)	2m 49s
test (1, default, ubuntu-latest)	2m 54s
test (1, x86, windows-latest)	4m 38s
test (min, default, windows-latest)	3m 19s
test (min, default, ubuntu-latest)	2m 43s
test (1, default, macOS-latest)	3m 57s
test (pre, x86, ubuntu-latest)	3m 43s
test (1, default, windows-latest)	3m 12s
test (nightly, default, windows-latest)	3m 52s
test (nightly, x86, ubuntu-latest)	4m 24s
test (nightly, default, macOS-latest)	3m 38s
test (min, x86, ubuntu-latest)	3m 11s
test (pre, default, windows-latest)	3m 27s
test (nightly, x86, windows-latest)	4m 58s
test (1, x86, ubuntu-latest)	3m 19s
test (pre, default, macOS-latest)	3m 2s
test (nightly, default, ubuntu-latest)	3m 31s
test (pre, x86, windows-latest)	4m 23s
	1h 11m 44s

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