Remove deprecated CONNECTION_CLASS attribute in flow handler?

[bj00rn]

Checklist

• I have filled out the template to the best of my ability.
• This only contains 1 feature request (if you have multiple feature requests, open one feature request for each feature request).
• This issue is not a duplicate feature request of previous feature requests.

Is your feature request related to a problem? Please describe.

CONNECTION_CLASS is deprecated since since 2021.6.0

integration_blueprint/custom_components/integration_blueprint/config_flow.py

Line 23 in 1c5dcfd

CONNECTION_CLASS = config_entries.CONN_CLASS_CLOUD_POLL

Kudos for a great template!

Describe the solution you'd like

Remove CONNECTION_CLASS

Describe alternatives you've considered

Keep it for backwards compatibility past 2021.6.0

Additional context

N/A

[ludeeus]

Removed in b7a34be 👍

Backward compatibility is not a concern for this repository.