fix: tweak keep-alive timeout implementation #13478

Job	Run time
Lint	40s
dependency-review	10s
Fuzzing	3m 38s
Test TypeScript types	35s
Test with Node.js 20 compiled --without-intl	5m 14s
Test with Node.js 21 compiled --without-intl	5m 25s
test (18, macos-latest) / Test with Node.js 18 on macos-latest	4m 27s
test (18, ubuntu-latest) / Test with Node.js 18 on ubuntu-latest	3m 6s
test (18, windows-latest) / Test with Node.js 18 on windows-latest	5m 40s
test (20, macos-latest) / Test with Node.js 20 on macos-latest	3m 47s
test (20, ubuntu-latest) / Test with Node.js 20 on ubuntu-latest	3m 35s
test (20, windows-latest) / Test with Node.js 20 on windows-latest	4m 46s
test (21, macos-latest) / Test with Node.js 21 on macos-latest	4m 11s
test (21, ubuntu-latest) / Test with Node.js 21 on ubuntu-latest	2m 49s
test (21, windows-latest) / Test with Node.js 21 on windows-latest	4m 54s
automerge	0s
	52m 57s

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