ruby-kafka is no longer maintained and superseded by librdkafka via rdkafka-ruby bindings

### Describe the bug

I just wanted to raise to your attention that based on the official statement from the ruby-kafka repo:

> This library is no longer actively developed and has been superseded by [librdkafka](https://github.com/edenhill/librdkafka) via [rdkafka-ruby](https://github.com/appsignal/rdkafka-ruby/) bindings. While this library may still receive security patches and bug fixes, it is no longer recommended for production usage.

ruby-kafka has some critical errors that can lead to data loss. Even zendesk already switched to it with their other operations.

While I cannot replace it fully (rdkafka and waterdrop maintainer here) in this plugin because of my limited knowledge, I am happy to help you guys out :)

The downside is jruby - which is something that will have to be figured out.

### To Reproduce

To reproduce or rather see, check the `.gemspec`

### Expected behavior

I would expect this library to use one of the maintained and recommended Kafka gem.

### Your Environment

```markdown
Applies to any environment.
```

### Your Configuration

Applies to any config.

### Your Error Log

```shell
Irrelevant.
```

### Additional context

Please close it if you feel this is not a bug and it should be raised as a discussion or something else. From my perspective it is a bug as it poses risk of data loss for the end users.