ci: Retry `brew update` a few times to avoid random failures
ci: Retry `brew update` a few times to avoid random failures

bitcoin/secp256k1,bitcoin/secp256k1,bitcoin/secp256k1,ElementsProject/secp256k1-zkp,bitcoin-core/secp256k1,ElementsProject/secp256k1-zkp,bitcoin-core/secp256k1,bitcoin/secp256k1,bitcoin/secp256k1,peterdettman/secp256k1,peterdettman/secp256k1