:art: move `_generate_next_value_` function to comply with python3.11

[twentylemon]

Summary

Setting up new Chromebook, I can't seem to get python3.10 on it. Running tests with 3.11, I get,

E TypeError: _generate_nextvalue must be defined before members

so moving those around to comply.

Checklist

• [x] this is a source code change
  • [x] run format in the repository root
  • [x] run pytest in the repository root
  • [ ] link to issue being fixed using a fixes keyword, if such an issue exists
  • [ ] update the wiki documentation if necessary
• [ ] or, this is not a source code change

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 96.51%. Comparing base (ba29814) to head (29a5493). Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
duckbot/cogs/games/satisfy/building.py	50.00%	1 Missing :warning:
duckbot/cogs/games/satisfy/item.py	50.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1005 +/- ## ======================================= Coverage 96.51% 96.51% ======================================= Files 95 95 Lines 2237 2237 Branches 165 165 ======================================= Hits 2159 2159 Misses 67 67 Partials 11 11 ```

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