Update dependency to-vfile to v8

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
to-vfile	^7.2.3 -> ^8.0.0

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Release Notes

vfile/to-vfile (to-vfile)

v8.0.0

Compare Source

Change

• 6532621 Change to require Node.js 16
  migrate: update Node
• 6ef35a8 Change to use export map
  migrate: don’t use private APIs
• 8068aaf Remove methods on toVFile
  migrate: toVFile.read() -> import {read} from 'to-vfile' and read()
• dd29b65 Remove Mode type
  migrate: get it from Node types if you want it
• e458bdc Update vfile

Misc

• 26070b9 Fix typo
  by @​johno in https://github.com/vfile/to-vfile/pull/22
• 33f33d1 Refactor docs
• 7857853 Refactor JSDoc
• 8d484e8 Refactor code-style
• 6e0dd65 Refactor tsconfig.json
• cd80cdd Refactor package.json

Full Changelog: vfile/to-vfile@7.2.4...8.0.0

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