Bump julia-actions/setup-julia from 1 to 2 #240

Job	Run time
sync-files (windows-latest, manipulation, 1, x64, false)	10m 34s
sync-files (windows-latest, modelica_conference_2021, 1, x64, false)	9m 41s
sync-files (windows-latest, multiple_instances, 1, x64, false)	9m 37s
sync-files (windows-latest, multiprocessing, 1, x64, false)	9m 47s
sync-files (windows-latest, multithreading, 1, x64, false)	10m 41s
sync-files (windows-latest, parameterize, 1, x64, false)	10m 16s
sync-files (windows-latest, simulate, 1, x64, false)	9m 42s
sync-files (windows-latest, parameter_optimization, 1, x64, false)	9m 39s
auto-commit	0s
call-docu	0s
	1h 19m 57s

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