chore: Improve `security_group_rules` type definition #59

Job	Run time
Collect workflow inputs	4s
Max TF pre-commit	2m 12s
Min TF pre-commit (./examples/memcached-cluster)	34s
Min TF pre-commit (.)	33s
Min TF pre-commit (./examples/serverless-cache)	1m 30s
Min TF pre-commit (./examples/redis-cluster-mode)	1m 16s
Min TF pre-commit (./examples/redis-global-replication-group)	1m 13s
Min TF pre-commit (./examples/redis-replication-group-with-cluster-replica)	1m 26s
Min TF pre-commit (./modules/serverless-cache)	31s
Min TF pre-commit (./modules/user-group)	35s
Min TF pre-commit (./examples/redis-replication-group)	1m 18s
Min TF pre-commit (./examples/valkey-replication-group)	37s
Min TF pre-commit (./examples/redis-cluster)	1m 15s
	13m 4s

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