Remove support for `Mantichora`

[codecov[bot]]

Codecov Report

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

Project coverage is 93.59%. Comparing base (ed579a3) to head (71ff07f).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #33 +/- ## ========================================== + Coverage 92.52% 93.59% +1.06% ========================================== Files 45 44 -1 Lines 2008 1967 -41 Branches 289 282 -7 ========================================== - Hits 1858 1841 -17 + Misses 129 105 -24 Partials 21 21 ```

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