Drops Python 3.7 support and adds Python 3.11 and 3.12

[codecov[bot]]

Codecov Report

Patch coverage has no change and project coverage change: +0.07% :tada:

Comparison is base (5372fdf) 86.36% compared to head (8d10c9f) 86.43%.

:exclamation: Current head 8d10c9f differs from pull request most recent head d556f07. Consider uploading reports for the commit d556f07 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #95 +/- ## ========================================== + Coverage 86.36% 86.43% +0.07% ========================================== Files 51 51 Lines 3043 3045 +2 Branches 473 490 +17 ========================================== + Hits 2628 2632 +4 + Misses 278 277 -1 + Partials 137 136 -1 ``` | [Flag](https://app.codecov.io/gh/SciQLop/speasy/pull/95/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SciQLop) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/SciQLop/speasy/pull/95/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SciQLop) | `85.77% <ø> (-0.59%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SciQLop#carryforward-flags-in-the-pull-request-comment) to find out more. [see 4 files with indirect coverage changes](https://app.codecov.io/gh/SciQLop/speasy/pull/95/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SciQLop)

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[jeandet]

Let's wait for pycdfpp before adding support for Python 3.12