Patch for IPv6 native clusters (airflow binds to ipv4 only by default)

[xorl]

What issues does your PR fix?

-fixes IPv6 native clusters cannot be reached on IPv4 addresses.

What does your PR do?

This PR makes the following changes...
Adds --hostname [::] to the exec airflow webserver command so that it binds to ipv6 as well as ipv4.

Checklist

For all Pull Requests

• Commits are signed off
• Commits have semantic messages
• Documentation updated
• Passes ct linting

For releasing ONLY

• Chart.yaml version bumped
• CHANGELOG.md updated

[xorl]

@thesuperzapper @gsemet Any chance we can get a review for this simple change? It's mission critical for an OpenMetadata dependency to support this.

[thesuperzapper]

@xorl thanks for raising this, but it turns out you can set this already with the AIRFLOW__WEBSERVER__WEB_SERVER_HOST config, so we don't need to expose a new value for it.

For example, you might set the following values:

airflow:
  config:
    AIRFLOW__WEBSERVER__WEB_SERVER_HOST: "[::]"