Support JLD2 v0.6 #706

Job	Run time
Julia 1 - ubuntu-latest - x64 - push	32m 0s
Julia 1.6 - macos-latest - x64 - push	49m 36s
Julia 1 - windows-latest - x64 - push	34m 36s
Julia 1.6 - windows-latest - x64 - push	44m 11s
Julia 1.6 - ubuntu-latest - x64 - push	37m 38s
Julia 1 - macos-latest - x64 - push	42m 40s
Julia 1 - macos-latest - arm64 - push	24m 46s
Julia pre - macos-latest - x64 - push	25m 29s
Julia pre - ubuntu-latest - x64 - push	27m 34s
Julia pre - windows-latest - x64 - push	29m 45s
	5h 48m 15s

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