Add support for Django 4.2

[irtazaakram]

Added support for Django 4.2 & drop python 3.7 (EOL). Can we have a new release after this PR is merged? Thanks,

[codecov-commenter]

Codecov Report

Merging #142 (d7abf91) into master (3d56077) will not change coverage. Report is 5 commits behind head on master. The diff coverage is n/a.

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@@            Coverage Diff             @@
##            master      #142    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files            6         8     +2     
  Lines          301       417   +116     
==========================================
+ Hits           301       417   +116     

see 2 files with indirect coverage changes

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[matthewhegarty]

Tested by running tox locally