We want to use bootstrap_strategy = "config", but it's only available in tarantool-3.0

See https://git.picodata.io/core/picodata/-/blob/a614c961729ef0f2d2c2f9b1287c6c20eb00d777/src/tarantool.rs#L298-305

            // TODO: in tarantool-3.0 there's a new bootstrap_strategy = "config"
            // which allows to specify the bootstrap leader explicitly. This is
            // what we want to use, so we should switch to that when that
            // feature is available in our tarantool fork.
            //
            // When joining we already know the leader, and the "auto" strategy
            // implies connecting to that leader during bootstrap.
            bootstrap_strategy: Some(BootstrapStrategy::Auto),

Blocked by tarantool#86