Clamp unsafe next outbound HTLC limit #23264

Job	Run time
ext-test	7m 15s
check_release	2m 58s
fuzz_sanity	11m 7s
linting	2m 40s
tor-connect	5m 55s
fuzz	47m 56s
build-workspace / build (self-hosted, 1.75.0)	21m 39s
rustfmt	14s
build-bindings / build (self-hosted, 1.75.0)	28m 44s
benchmark	17m 20s
build-sync / build (self-hosted, 1.75.0)	24m 49s
build-features / build (self-hosted, 1.75.0)	32m 18s
check_docs	7m 32s
build-nostd / build (self-hosted, 1.75.0)	15m 18s
build-cfg-flags / build (self-hosted, 1.75.0)	14m 39s
coverage	24m 39s
notify-failure	0s
	4h 25m 3s

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