Bump codecov/codecov-action from 5 to 6 (#211) #286

Job	Run time
Julia 1 - macOS-latest - x64 - push	11m 35s
Julia lts - ubuntu-latest - x64 - push	3m 25s
Julia nightly - ubuntu-latest - x64 - push	5m 8s
Julia lts - windows-latest - x64 - push	5m 35s
Julia 1 - windows-latest - x64 - push	7m 27s
Julia nightly - windows-latest - x64 - push	9m 29s
Julia lts - macOS-latest - x64 - push	6m 22s
Julia 1 - ubuntu-latest - x64 - push	5m 7s
Julia nightly - macOS-latest - x64 - push	15m 38s
	1h 9m 46s

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