SentinelsClient: Use the given protocol to connect to sentinels

[jlledom]

I was trying to connect to some sentinels that require password authentication. For that, I created a new protocol as in the example: https://github.com/socketry/async-redis/blob/main/examples/auth/protocol.rb

class AuthenticatedRESP2
  def initialize(password)
    @password = password
  end

  def client(stream)
    client = Async::Redis::Protocol::RESP2.client(stream)

    client.write_request(["AUTH", *@password])
    client.read_response # Ignore response.

    client
  end
end

When SentinelsClient is used, it ignores the provided protocol when it tries to resolve address for master and slaves. As a result, password protected sentinels are not supported by async-redis.

This PR includes a small change to fix that.

Types of Changes

• Bug fix.

Contribution

• [ ] I added tests for my changes.
• [x] I tested my changes locally.
• [x] I agree to the Developer's Certificate of Origin 1.1.