fix: Allow IPv6 IPAM pool without requiring IPv4 IPAM #772

Job	Run time
Collect workflow inputs	6s
Max TF pre-commit	2m 19s
Min TF pre-commit (./examples/simple)	41s
Min TF pre-commit (./examples/flow-log)	42s
Min TF pre-commit (./examples/secondary-cidr-blocks)	40s
Min TF pre-commit (./examples/ipam)	35s
Min TF pre-commit (./examples/issues)	40s
Min TF pre-commit (./examples/block-public-access)	30s
Min TF pre-commit (./modules/vpc-endpoints)	30s
Min TF pre-commit (./examples/complete)	37s
Min TF pre-commit (./examples/ipv6-only)	38s
Min TF pre-commit (./modules/flow-log)	39s
Min TF pre-commit (./examples/network-acls)	39s
Min TF pre-commit (./examples/ipv6-dualstack)	40s
Min TF pre-commit (./examples/separate-route-tables)	38s
Min TF pre-commit (./examples/outpost)	38s
Min TF pre-commit (.)	37s
Min TF pre-commit (./examples/manage-default-vpc)	43s
	12m 32s

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