chore: Improve `security_group_rules` type definition #57

Job	Run time
Collect workflow inputs	3s
Max TF pre-commit	2m 13s
Min TF pre-commit (.)	1m 5s
Min TF pre-commit (./examples/redis-cluster-mode)	1m 6s
Min TF pre-commit (./examples/valkey-replication-group)	1m 4s
Min TF pre-commit (./examples/redis-cluster)	1m 8s
Min TF pre-commit (./examples/redis-replication-group-with-cluster-replica)	1m 3s
Min TF pre-commit (./examples/memcached-cluster)	1m 4s
Min TF pre-commit (./examples/redis-replication-group)	1m 6s
Min TF pre-commit (./examples/redis-global-replication-group)	1m 15s
Min TF pre-commit (./examples/serverless-cache)	1m 12s
Min TF pre-commit (./modules/user-group)	1m 9s
Min TF pre-commit (./modules/serverless-cache)	1m 15s
	14m 43s

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