Bump julia-actions/setup-julia from 1 to 2 #314

Job	Run time
test (ubuntu-latest, x64, 1.6)	3m 11s
test (ubuntu-latest, x64, 1)	3m 8s
test (ubuntu-latest, x64, nightly)	3m 22s
test (ubuntu-latest, x86, 1.6)	4m 10s
test (ubuntu-latest, x86, 1)	3m 15s
test (ubuntu-latest, x86, nightly)	3m 27s
test (macOS-13, x64, 1.6)	4m 45s
test (macOS-13, x64, 1)	3m 28s
test (macOS-13, x64, nightly)	4m 16s
test (macOS-14, aarch64, 1)	3m 1s
test (macOS-14, aarch64, nightly)	3m 24s
test (windows-latest, x64, 1.6)	5m 45s
test (windows-latest, x64, 1)	5m 5s
test (windows-latest, x64, nightly)	4m 40s
test (windows-latest, x86, 1.6)	4m 25s
test (windows-latest, x86, 1)	4m 34s
test (windows-latest, x86, nightly)	3m 34s
	1h 7m 30s

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