[feature] Upgrade Django channels to 4.2

[AviGawande]

Checklist

• I have read the OpenWISP Contributing Guidelines.
• I have manually tested the changes proposed in this pull request.
• I have written new test cases for new code and/or updated existing tests for changes to existing code.
• I have updated the documentation.

Reference to Existing Issue

Closes #388 .

Please open a new issue if there isn't an existing issue yet.

Description of Changes

Please describe these changes.

Screenshot

Please include any relevant screenshots.

[nemesifier]

@AviGawande do you really think if it was this easy we wouldn't have done it yet?
It costs less time to do this change than opening the issue.

Are you working on the other modules as well apart from this?

[coveralls]

coverage: 96.18%. first build
when pulling d5a3ace on AviGawande:upgrade-django-channels
into 6c93115 on openwisp:master.

[AviGawande]

yes i am working on this issue and i have opened Pull Request on Django_loci for channels==4.2

[nemesifier]

@AviGawande thanks a lot for the clarification, can you please link all the PRs from the other modules/packages in a bullet list in the description of this PR? This will make it easier for us to navigate all the work linked to this. We can't merge this until we get all modules onboard or builds will start failing in other modules, causing issues to developers and contributors. Thank you 🙏

[AviGawande]

Sure @nemesifier i am working on remaining modules one-by-one