tests: allow to run test with py311,312 / dj42,51. remove eol version…

[gawel]

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This PR allow to use Django 4.2 to 5.1.

A test was added to prove the need of get_sequences (will solve #567)

Also there is the need to take care of the new STORAGE settings.

Various metadata have been updated.

Since we use this package in production, the merge would be greatly appreciated.