added numpy upper cap and improved ref formatting

[codecov[bot]]

Codecov Report

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

Project coverage is 53.1%. Comparing base (3363c3b) to head (fb057ec). Report is 26 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #17 +/- ## ===================================== Coverage 53.1% 53.1% ===================================== Files 6 6 Lines 2815 2815 ===================================== Hits 1496 1496 Misses 1319 1319 ``` | [Flag](https://app.codecov.io/gh/cda-tum/mqt-qao/pull/17/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cda-tum) | Coverage Δ | | |---|---|---| | [python](https://app.codecov.io/gh/cda-tum/mqt-qao/pull/17/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cda-tum) | `53.1% <ø> (ø)` | | 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=cda-tum#carryforward-flags-in-the-pull-request-comment) to find out more.

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