[7.17] Bump ironbank 9.6

[pierrehilbert]

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• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

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[elasticmachine]

Pinging @elastic/elastic-agent-data-plane (Team:Elastic-Agent-Data-Plane)

[belimawr]

libbeat/outputs/kafka TestKafkaPublish/run_test(1):_publish_single_event_with_topic_from_type is timing out 🤔

It's coming from this bit of code:

beats/libbeat/outputs/kafka/kafka_integration_test.go

Lines 470 to 477 in 89c98af

	for len(messages) < nMessages {
	select {
	case msg := <-msgs:
	messages = append(messages, msg)
	case <-timer:
	break
	}
	}

I didn't investigate it, let me know if you want me to take a look at it @pierrehilbert.

[pierrehilbert]

This is a known issue created by you indeed haha: #44032

[ebeahan]

Approving the changes since the CI failure is related to known flakiness.