Use more sophisticated random seed

[codecov[bot]]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (9970eef) 94.17% compared to head (a05be93) 94.17%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #199 +/- ## ======================================= Coverage 94.17% 94.17% ======================================= Files 122 122 Lines 4839 4840 +1 ======================================= + Hits 4557 4558 +1 Misses 282 282 ``` | [Files](https://app.codecov.io/gh/1kastner/conflowgen/pull/199?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=1kastner) | Coverage Δ | | |---|---|---| | [...onflowgen/api/container\_flow\_generation\_manager.py](https://app.codecov.io/gh/1kastner/conflowgen/pull/199?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=1kastner#diff-Y29uZmxvd2dlbi9hcGkvY29udGFpbmVyX2Zsb3dfZ2VuZXJhdGlvbl9tYW5hZ2VyLnB5) | `96.87% <100.00%> (+0.10%)` | :arrow_up: | | [...ation/repositories/random\_seed\_store\_repository.py](https://app.codecov.io/gh/1kastner/conflowgen/pull/199?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=1kastner#diff-Y29uZmxvd2dlbi9hcHBsaWNhdGlvbi9yZXBvc2l0b3JpZXMvcmFuZG9tX3NlZWRfc3RvcmVfcmVwb3NpdG9yeS5weQ==) | `97.82% <100.00%> (+0.09%)` | :arrow_up: | | [...nerator/assign\_destination\_to\_container\_service.py](https://app.codecov.io/gh/1kastner/conflowgen/pull/199?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=1kastner#diff-Y29uZmxvd2dlbi9mbG93X2dlbmVyYXRvci9hc3NpZ25fZGVzdGluYXRpb25fdG9fY29udGFpbmVyX3NlcnZpY2UucHk=) | `100.00% <ø> (ø)` | |

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