Update dependency unfetch to v4.1.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
unfetch	dependencies	minor	4.0.1 -> 4.1.0	source

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Release Notes

developit/unfetch

### [`v4.1.0`](https://togithub.com/developit/unfetch/releases/4.1.0) [Compare Source](https://togithub.com/developit/unfetch/compare/4.0.1...4.1.0) - Fix TypeScript definitions ([#​99](https://togithub.com/developit/unfetch/issues/99) [#​105](https://togithub.com/developit/unfetch/issues/105) - thanks [@​stephenmathieson](https://togithub.com/stephenmathieson) & [@​Fnatte](https://togithub.com/Fnatte)!) - Drop another 20 bytes, now 478b 🐕

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