fix: Shutdown issues

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 64.28571% with 10 lines in your changes missing coverage. Please review.

Project coverage is 96.37%. Comparing base (dc8b9a7) to head (e37ff55). Report is 1 commits behind head on master.

Files	Patch %	Lines
...rc/main/java/fr/quatrevieux/araknemu/Araknemu.java	56.52%	7 Missing and 3 partials :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #352 +/- ## ============================================ - Coverage 96.41% 96.37% -0.04% - Complexity 9311 9313 +2 ============================================ Files 1424 1424 Lines 23818 23834 +16 Branches 1551 1553 +2 ============================================ + Hits 22963 22970 +7 - Misses 647 653 +6 - Partials 208 211 +3 ```

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