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[bot]]

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

```diff @@ Coverage Diff @@ ## master #180 +/- ## ======================================= Coverage 96.66% 96.66% ======================================= Files 6 6 Lines 599 599 ======================================= Hits 579 579 Misses 20 20 ``` | [Impacted Files](https://app.codecov.io/gh/vinitkumar/json2xml/pull/180?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Vinit+Kumar) | Coverage Δ | | |---|---|---| | [json2xml/\_\_init\_\_.py](https://app.codecov.io/gh/vinitkumar/json2xml/pull/180?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Vinit+Kumar#diff-anNvbjJ4bWwvX19pbml0X18ucHk=) | `100.00% <100.00%> (ø)` | |

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