chore(deps): update dependency c8 to v9

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
c8	^8.0.1 -> ^9.0.0

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Release Notes

bcoe/c8 (c8)

v9.0.0

Compare Source

⚠ BREAKING CHANGES

• build: minimum Node.js version is now 14.14.0

Features

• build: minimum Node.js version is now 14.14.0 (2cdc86b)
• deps: update foreground-child to promise API (#​512) (b46b640)
• deps: use Node.js built in rm (2cdc86b)

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