CompatHelper: bump compat for "DiskArrays" to "0.4" #592

Job	Run time
Documentation	1m 12s
Julia 1.6 - ubuntu-latest - x64	4m 1s
Julia 1.6 - macOS-latest - x64	4m 25s
Julia 1.6 - windows-latest - x64	14m 37s
Julia 1 - ubuntu-latest - x64	49s
Julia 1 - macOS-latest - x64	2m 4s
Julia 1 - windows-latest - x64	1m 28s
Julia nightly - ubuntu-latest - x64	3m 36s
Julia nightly - macOS-latest - x64	5m 5s
Julia nightly - windows-latest - x64	4m 22s
	41m 39s

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