Update dependency hexo to v4.2.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
hexo (source)	devDependencies	patch	4.2.0 -> 4.2.1

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Release Notes

hexojs/hexo

### [`v4.2.1`](https://togithub.com/hexojs/hexo/releases/4.2.1) [Compare Source](https://togithub.com/hexojs/hexo/compare/4.2.0...4.2.1) Before `4.2.0`, Hexo does not work with Node 14. This is a patch release for support Node 14. #### Fix - chore: incompatible with Node 14 [#​4285] - chore(deps): bump hexo-util from 1.8.0 to 1.9.1 - chore(deps): bump hexo-util from 2.0.0 to 2.0.1

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