refactor: remove duplicated types

[bluwy]

There was dist/index.d.ts and dist/index.d.mts with the same content. With this PR, only index.d.mts is kept. As "types" is using .d.mts, only TypeScript 4.7 and above will work, which I think should be ok considering that it's nearly 3 years ago and we're modernizing the package.

Ideally sticking with index.d.ts and removing index.d.mts could help with compatibility, but it doesn't seem configurable with unbuild.

(I didn't add a changeset as this could be part of the ESM-only changeset, but let me know if needed)

[changeset-bot]

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Latest commit: e22c83a

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commit: e22c83a

[dreyfus92]

thank you @bluwy 🫡