chore(deps): update dependency defu to v5

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
defu	^3.2.2 -> ^5.0.0

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Release Notes

unjs/defu

### [`v5.0.0`](https://togithub.com/unjs/defu/blob/master/CHANGELOG.md#​500-httpsgithubcomunjsdefucomparev401v500-2021-05-12) [Compare Source](https://togithub.com/unjs/defu/compare/v4.0.1...v5.0.0) ##### ⚠ BREAKING CHANGES - `undefined` values will be bypassed and not consistent behavior with defaults-deep anymore. ##### Features - skip nullish values from source ([#​29](https://togithub.com/unjs/defu/issues/29)) ([076f10a](https://togithub.com/unjs/defu/commit/076f10a77fc1384f53e0586d3c77d754cd419f06)) ##### [4.0.1](https://togithub.com/unjs/defu/compare/v4.0.0...v4.0.1) (2021-04-23) ### [`v4.0.1`](https://togithub.com/unjs/defu/blob/master/CHANGELOG.md#​401-httpsgithubcomunjsdefucomparev400v401-2021-04-23) [Compare Source](https://togithub.com/unjs/defu/compare/v4.0.0...v4.0.1) ### [`v4.0.0`](https://togithub.com/unjs/defu/blob/master/CHANGELOG.md#​400-httpsgithubcomunjsdefucomparev322v400-2021-04-23) [Compare Source](https://togithub.com/unjs/defu/compare/v3.2.2...v4.0.0) ##### ⚠ BREAKING CHANGES - module exports ##### Features - module exports ([42df406](https://togithub.com/unjs/defu/commit/42df406b6938bc7ffb5f628efaa9447c4e95b211)) ##### [3.2.2](https://togithub.com/unjs/defu/compare/v3.2.1...v3.2.2) (2020-11-10) ##### Bug Fixes - switch back to bili for es5 support till fixing in siroc ([07786c2](https://togithub.com/unjs/defu/commit/07786c270f9bf49529d8203f31b4b9bd696a6ee3)) ##### [3.2.1](https://togithub.com/unjs/defu/compare/v3.2.0...v3.2.1) (2020-11-09) ##### Bug Fixes - **types:** correct type inference where merged types are same ([#​26](https://togithub.com/unjs/defu/issues/26)) ([f322607](https://togithub.com/unjs/defu/commit/f322607515a5bd19b1a2f28d7e3336fee9194520))

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[codecov[bot]]

Codecov Report

Merging #102 (0cf4e8c) into main (18bb2d3) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##              main      #102   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           21        21           
  Branches         4         4           
=========================================
  Hits            21        21           

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