use flat eslint config + eslint-plugin-mmkal

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 99.18200% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 99.45%. Comparing base (6a65d0b) to head (f0843c1).

Files	Patch %	Lines
src/umzug.ts	98.52%	3 Missing :warning:
src/file-locker.ts	96.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #652 +/- ## ======================================= Coverage 99.45% 99.45% ======================================= Files 12 12 Lines 1464 1467 +3 Branches 267 276 +9 ======================================= + Hits 1456 1459 +3 Misses 8 8 ```

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[github-actions[bot]]

Released in v3.8.0.