update pypi dev status from pre-alpha to alpha

[niksirbi]

I had completely forgotten this was still set to "Pre-Alpha". I think "Alpha" is justified in our case?

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.67%. Comparing base (31e7419) to head (2e2c9b3).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #172 +/- ## ======================================= Coverage 99.67% 99.67% ======================================= Files 10 10 Lines 619 619 ======================================= Hits 617 617 Misses 2 2 ```

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[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud