Fixes `sendBits()`'s handling of signed numbers in `svsim` (backport #4599) #3179

Job	Run time
ci (ubuntu-22.04, 8, 2.13.12, 2.4) / ci	15m 48s
ci (ubuntu-22.04, 8, 2.13.12, 2.4) / Formatting	3m 45s
ci (ubuntu-22.04, 8, 2.13.12, 2.4) / compile project with mill	3m 5s
ci (ubuntu-22.04, 8, 2.13.12, 2.4) / Integration Tests	10m 6s
ci (ubuntu-22.04, 8, 2.13.12, 2.4) / Standard Library Tests (2.13.12)	2m 18s
ci (ubuntu-22.04, 8, 2.13.12, 2.4) / Build Mdoc & Website	6m 25s
ci (ubuntu-22.04, 8, 2.13.12, 2.4) / Test Scala-CLI Example / Build and Test	3m 37s
check tests	1s
all tests passed	1s
Deploy Website	0s
publish	0s
	45m 6s

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