fix/upgrade python

[vinitkumar]

• fix: update python
• fix: try to build in 3.12
• fix: check again
• fix: one more try
• fix: improve coverage
• fix: drop support for Python 3.7
• feat: check against pypy 3.10 too
• feat: use Python 3.12 beta 4
• fix: update makefile to account for us using pytes
• fix: add some more tests
• fix: line issues
• fix: bump version

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (d38d0db) 96.66% compared to head (895fef7) 96.66%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #180   +/-   ##
=======================================
  Coverage   96.66%   96.66%           
=======================================
  Files           6        6           
  Lines         599      599           
=======================================
  Hits          579      579           
  Misses         20       20           

Impacted Files	Coverage Δ
json2xml/__init__.py	100.00% <100.00%> (ø)

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