Bump ArnoldiMethods.jl to v0.4 #93

Job	Run time
Julia 1.6 - ubuntu-latest - x64 - pull_request	4m 30s
Julia 1.6 - macos-latest - x64 - pull_request	5m 14s
Julia 1 - ubuntu-latest - x64 - pull_request	2m 33s
Julia 1 - macos-latest - x64 - pull_request	3m 33s
Julia nightly - ubuntu-latest - x64 - pull_request	2m 45s
Julia nightly - macos-latest - x64 - pull_request	4m 35s
	23m 10s

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