Tests

Bump actions/checkout from 4 to 6 #277

Job	Run time
Tests (lts, lib/JumpProblemLibrary) / Tests	5m 29s
Tests (lts, lib/ODEProblemLibrary) / Tests	1m 36s
Tests (1, lib/SDEProblemLibrary) / Tests	1m 59s
Tests (1, .) / Tests	10m 22s
Tests (1, lib/JumpProblemLibrary) / Tests	4m 14s
Tests (1, lib/BVProblemLibrary) / Tests	2m 18s
Tests (1, lib/NonlinearProblemLibrary) / Tests	54s
Tests (lts, lib/BVProblemLibrary) / Tests	1m 39s
Tests (lts, lib/DDEProblemLibrary) / Tests	1m 7s
Tests (lts, lib/DAEProblemLibrary) / Tests	1m 25s
Tests (1, lib/DAEProblemLibrary) / Tests	2m 6s
Tests (1, lib/DDEProblemLibrary) / Tests	2m 11s
Tests (1, lib/ODEProblemLibrary) / Tests	2m 10s
Tests (lts, .) / Tests	1m 33s
Tests (lts, lib/SDEProblemLibrary) / Tests	59s
Tests (lts, lib/NonlinearProblemLibrary) / Tests	56s
	40m 58s

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