Tests

CompatHelper: bump compat for CUDA in [weakdeps] to 6, (keep existing compat) #1394

Job	Run time
Tests (lts, macOS-latest) / Julia lts - macOS-latest	32s
Tests (lts, ubuntu-latest) / Julia lts - ubuntu-latest	25s
Tests (1, windows-latest) / Julia 1 - windows-latest	52s
Tests (lts, windows-latest) / Julia lts - windows-latest	47s
Tests (1, macOS-latest) / Julia 1 - macOS-latest	34s
Tests (1, ubuntu-latest) / Julia 1 - ubuntu-latest	33s
	3m 43s

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