Update dependency unfetch to v5

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
unfetch	4.2.0 -> 5.0.0

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Release Notes

developit/unfetch (unfetch)

v5.0.0

Compare Source

What's Changed

• Add TypeScript definitions and export them @​developit in https://github.com/developit/unfetch/pull/159
• Add Package Exports to both unfetch and isomorphic-unfetch

New Contributors

• @​RishikeshDarandale made their first contribution to isomorphic-unfetch in https://github.com/developit/unfetch/pull/156

Full Changelog: developit/unfetch@4.2.0...5.0.0

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