fix: declaration file

[Virtute90]

Docs ref: https://www.typescriptlang.org/docs/handbook/declaration-files/publishing.html

Fixes #972

PR Checklist

• [x] My branch is up-to-date with the Upstream main branch.
• [ ] The unit tests pass locally with my changes (if applicable).
• [ ] I have added tests that prove my fix is effective or that my feature works (if applicable).
• [ ] I have added necessary documentation (if appropriate).

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Name	Status	Preview	Updated (UTC)
design-react-kit	✅ Ready (Inspect)	Visit Preview	Feb 28, 2024 1:29pm

[codecov[bot]]

Codecov Report

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

Project coverage is 94.78%. Comparing base (bb5e8fa) to head (d730dae).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1027 +/- ## ======================================= Coverage 94.78% 94.78% ======================================= Files 285 285 Lines 2857 2857 Branches 726 726 ======================================= Hits 2708 2708 Misses 147 147 Partials 2 2 ``` | [Flag](https://app.codecov.io/gh/italia/design-react-kit/pull/1027/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=italia) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/italia/design-react-kit/pull/1027/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=italia) | `94.78% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=italia#carryforward-flags-in-the-pull-request-comment) to find out more.

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