[CI] Update julia version in CI #18

Job	Run time
Julia 1.6 - ubuntu-latest - x64 - pull_request	39s
Julia 1.6 - ubuntu-latest - x86 - pull_request	38s
Julia 1.6 - macOS-latest - x64 - pull_request	1m 4s
Julia 1.6 - windows-latest - x64 - pull_request	10m 27s
Julia latest - ubuntu-latest - x64 - pull_request	7s
Julia latest - ubuntu-latest - x86 - pull_request	3s
Julia latest - macOS-latest - x64 - pull_request	8s
Julia latest - windows-latest - x64 - pull_request	14s
Julia nightly - ubuntu-latest - x64 - pull_request	1m 22s
Julia nightly - ubuntu-latest - x86 - pull_request	2m 1s
Julia nightly - macOS-latest - x64 - pull_request	2m 33s
Julia nightly - windows-latest - x64 - pull_request	3m 24s
	22m 40s

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