Bump actions/upload-artifact from 4 to 7 #811

Job	Run time
call / tests (macos-latest, tests)	57s
call / tests (windows-latest, tests)	2m 14s
call / checks (ubuntu-latest, 3.13)	1m 24s
call / checks (ubuntu-latest, 3.10)	1m 34s
call / validate (ubuntu-latest, 3.12, validate)	2m 44s
call / checks (ubuntu-24.04, 3.11)	1m 34s
	10m 27s

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