add support for django 4.2 and python 3.10, drop support for django 2…

[FreemanPancake]

• Add support for Django 4.2, now supports Django [3.2, 4.2]
• Add support for Python 3.10, now supports Python [3.8, 3.9, 3.10]
• Drop support for Django 2.x
• Drop support for Python 3.6 & 3.7

[joshyu]

@Aiky30 / @fsbraun please help to review.
I find that the workflow need maintainer's approval and then can run.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (support/4.0.x@a98d71a). Click here to learn what that means.

Additional details and impacted files

@@               Coverage Diff                @@
##             support/4.0.x      #86   +/-   ##
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  Coverage                 ?   77.76%           
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  Files                    ?       30           
  Lines                    ?      778           
  Branches                 ?       76           
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  Hits                     ?      605           
  Misses                   ?      153           
  Partials                 ?       20           

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[fsbraun]

@FreemanPancake @joshyu Can you please reopen this PR against master? djangocms-url-manager is fully compatible with django CMS 4.0. The difference of the master branch is, that django 2.2 support already had been removed. We can keep one code base.

[joshyu]

@FreemanPancake @joshyu Can you please reopen this PR against master? djangocms-url-manager is fully compatible with django CMS 4.0. The difference of the master branch is, that django 2.2 support already had been removed. We can keep one code base.

@fsbraun ,
Thanks for your confirmation about our work. That makes sense, we will raise another PR based on master branch.

[fsbraun]

Superseeded by #87