fix(net): Fix Bolero generator for UnicastIpv4Addr #4441

Job	Run time
Deduce required tests from code changes	8s
debug	5m 20s
fuzz sterile	8m 36s
release sterile	12m 59s
debug sterile	8m 26s
v-gw-iso-l2vni / run	22m 18s
v-gw-iso-l3vni / run	23m 24s
h-gw-iso-l2vni / run	0s
v-up25.05-gw-iso-l2vni / run	0s
Summary	2s
publish	0s
	1h 21m 13s

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