fix: flatten maven poms

[codecov-commenter]

Codecov Report

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

Project coverage is 45.00%. Comparing base (a1be86e) to head (eec96e1).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #361 +/- ## ========================================= Coverage 45.00% 45.00% Complexity 384 384 ========================================= Files 184 184 Lines 2024 2024 Branches 107 107 ========================================= Hits 911 911 Misses 1082 1082 Partials 31 31 ``` | [Flag](https://app.codecov.io/gh/Miragon/miranum/pull/361/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Miragon) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/Miragon/miranum/pull/361/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Miragon) | `45.00% <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=Miragon#carryforward-flags-in-the-pull-request-comment) to find out more.

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