chore: Improve `security_group_rules` type definition #58

Job	Run time
Collect workflow inputs	7s
Max TF pre-commit	1m 30s
Min TF pre-commit (./examples/serverless-cache)	36s
Min TF pre-commit (./examples/redis-replication-group-with-cluster-replica)	34s
Min TF pre-commit (./examples/redis-replication-group)	33s
Min TF pre-commit (.)	33s
Min TF pre-commit (./modules/serverless-cache)	36s
Min TF pre-commit (./examples/redis-cluster-mode)	22s
Min TF pre-commit (./examples/redis-cluster)	22s
Min TF pre-commit (./modules/user-group)	36s
Min TF pre-commit (./examples/memcached-cluster)	37s
Min TF pre-commit (./examples/valkey-replication-group)	21s
Min TF pre-commit (./examples/redis-global-replication-group)	34s
	7m 21s

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