Bump codecov/codecov-action from 6 to 7 (#532) #752

Job	Run time
Julia min-patch - windows-latest	5m 9s
Documentation	1m 55s
Julia min-patch - ubuntu-latest	4m 1s
Julia pre - macOS-latest	27s
Julia lts - windows-latest	4m 57s
Julia lts - ubuntu-latest	4m 16s
Julia pre - ubuntu-latest	45s
Julia 1 - macOS-latest	7m 6s
Julia lts - macOS-latest	3m 0s
Julia min-patch - macOS-latest	4m 21s
Julia 1 - windows-latest	6m 3s
Julia pre - windows-latest	53s
Julia 1 - ubuntu-latest	6m 50s
	49m 43s

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