private int randomTimeout(final int timeoutMs) {
        return ThreadLocalRandom.current().nextInt(timeoutMs, timeoutMs + this.raftOptions.getMaxElectionDelayMs());
    }
Get max priority value for all nodes in the same Raft group, and update current node's target priority value.

@param peerIds peer nodes in the same Raft group
jraft-core/src/main/java/com/alipay/sofa/jraft/core/NodeImpl.java