Extend test matrix with django 4.2, python 3.11 and python 3.12-dev

[foarsitter]

This PR extends the test matrix with the latest versions and removes testing for python 3.8 & 3.9 against main.

[claudep]

Looks like we worked in parallel :sob: (-> #235).

[codecov[bot]]

Codecov Report

Merging #236 (5e66571) into master (3eb4a43) will decrease coverage by 0.67%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #236      +/-   ##
==========================================
- Coverage   93.88%   93.22%   -0.67%     
==========================================
  Files          10       11       +1     
  Lines         523      531       +8     
  Branches       66       67       +1     
==========================================
+ Hits          491      495       +4     
- Misses         19       22       +3     
- Partials       13       14       +1     

see 1 file with indirect coverage changes

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[foarsitter]

@claudep haha, yes we did. Will close this since your PR includes the correct classifiers & a changelog item.

[claudep]

Thanks anyway! (I took the djmain -> djangomain fix from your patch)