feat!: increase minimum vim/nvim versions

[fannheyward]

• vim 9.0.0438
• nvim 0.8.0

[codecov[bot]]

Codecov Report

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

Project coverage is 98.53%. Comparing base (c3ae5c3) to head (8c971a9).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #5026 +/- ## ========================================== + Coverage 98.51% 98.53% +0.01% ========================================== Files 273 273 Lines 26074 26072 -2 Branches 5391 5389 -2 ========================================== + Hits 25688 25691 +3 + Misses 228 223 -5 Partials 158 158 ```

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