switch to iostream #588

Job	Run time
docs	4m 21s
build-and-test (ubuntu-22.04, NO)	1m 4s
build-and-test (macos-14, NO)	1m 19s
build-and-test (macos-15-intel, NO)	2m 38s
build-and-test (macos-15-intel, YES)	2m 28s
build-and-test (windows-latest, YES)	4m 4s
build-and-test (windows-latest, NO)	3m 59s
build-and-test (ubuntu-22.04, YES)	52s
build-and-test (macos-14, YES)	1m 11s
	21m 56s

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