fix(bindings): refcount Pool to fix teardown panic #1386

Job	Run time
spec tests - prepare	57s
build & test (ubuntu-24.04-arm)	1m 16s
bindings - test	2m 28s
build & test (ubuntu-latest)	3m 43s
build & test (macos-latest)	2m 19s
build fuzz harnesses	2m 13s
spec tests - ssz generic	2m 51s
spec tests - bls	1m 40s
slow tests	5m 50s
spec tests - ssz static mainnet	3m 47s
spec tests - mainnet (random)	6m 9s
spec tests - mainnet (sanity)	6m 11s
spec tests - mainnet (rewards)	5m 5s
spec tests - mainnet (operations)	6m 8s
spec tests - minimal (merkle_proof)	2m 41s
spec tests - minimal (finality)	2m 25s
spec tests - minimal (epoch_processing)	3m 14s
spec tests - mainnet (transition)	5m 52s
spec tests - minimal (transition)	2m 47s
spec tests - minimal (random)	3m 31s
spec tests - minimal (rewards)	3m 8s
spec tests - minimal (fork)	2m 45s
spec tests - minimal (sanity)	2m 55s
spec tests - mainnet (epoch_processing)	6m 8s
spec tests - ssz static minimal	6m 12s
spec tests - mainnet (merkle_proof)	3m 14s
spec tests - minimal (operations)	3m 5s
spec tests - mainnet (finality)	3m 49s
spec tests - mainnet (fork)	5m 28s
	1h 47m 51s

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