remove indirect keep alive #1371

Job	Run time
build (ubuntu-24.04, 3.12, tests)	1m 57s
build (ubuntu-22.04, 3.12, full, coverage)	1m 54s
build (ubuntu-20.04, 3.8, full)	1m 55s
build (ubuntu-latest, 3.13, tests)	4m 11s
build (ubuntu-latest, 3.11, tests)	1m 40s
build (ubuntu-latest, 3.10, tests)	1m 40s
build (ubuntu-latest, 3.9, tests)	1m 50s
build (windows-latest, 3.12, tests)	2m 42s
build (windows-2019, 3.8, tests)	2m 57s
build (macos-latest, 3.12, tests)	1m 48s
build (macos-11, 3.8, tests)	2m 24s
build (ubuntu--latest, 3.12, validate)	1s
	24m 59s

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