Bump codecov/codecov-action from 3 to 4 #304

Job	Run time
precondition	2s
lint (.)	29s
lint (tests/suite)	26s
lint	18s
lint (tests/mssql)	37s
test-unit (ubuntu-latest, 1.19.x, 386)	1s
lint (tests/mysql)	37s
test-unit (ubuntu-latest, 1.19.x, amd64)	1s
lint (tests/postgres)	30s
test-unit (ubuntu-latest, 1.20.x, 386)	1s
test-unit (ubuntu-latest, 1.20.x, amd64)	2s
test-unit (macos-latest, 1.19.x, amd64)	1s
test-unit (macos-latest, 1.20.x, amd64)	1s
test-unit (windows-latest, 1.19.x, 386)	1s
test-unit (windows-latest, 1.19.x, amd64)	1s
test-unit (windows-latest, 1.20.x, 386)	2s
test-unit (windows-latest, 1.20.x, amd64)	1s
test-compatibility-mssql	0s
test-compatibility-postgres	0s
test-compatibility-mysql	0s
	3m 11s

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