Bump actions/checkout from 5 to 6 (#252) #346

Job	Run time
Documentation	2m 33s
Julia 1 - windows-latest - x86 - push	5m 27s
Julia lts - windows-latest - x86 - push	2m 40s
Julia lts - macos-latest - default - push	1m 6s
Julia 1 - windows-latest - default - push	5m 0s
Julia min - ubuntu-latest - x64 - push	1m 1s
Julia lts - ubuntu-latest - x86 - push	1m 42s
Julia lts - ubuntu-latest - default - push	1m 24s
Julia 1 - ubuntu-latest - default - push	3m 33s
Julia 1 - ubuntu-latest - x86 - push	5m 7s
Julia lts - windows-latest - default - push	2m 8s
Julia 1 - macos-latest - default - push	2m 30s
	34m 11s

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