Update dependency cosmiconfig to v8

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
cosmiconfig	^6.0.0 -> ^8.0.0

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Release Notes

davidtheclark/cosmiconfig

v8.0.0

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No major breaking changes! We dropped support for Node 10 and 12 -- which you're probably not using. And we swapped out the YAML parser -- which you probably won't notice.

• Breaking change: Drop support for Node 10 and 12.
• Breaking change: Use npm package js-yaml to parse YAML instead of npm package yaml.
• Added: Loader errors now include the path of the file that was tried to be loaded.

v7.1.0

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• Added: Additional default searchPlaces within a .config subdirectory (without leading dot in the file name)

v7.0.1

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• Fixed: If there was a directory that had the same name as a search place (e.g. "package.json"), we would try to read it as a file, which would cause an exception.

v7.0.0

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• Breaking change: Add ${moduleName}rc.cjs and ${moduleName}.config.cjs to the default searchPlaces, to support users of "type": "module" in recent versions of Node.
• Breaking change: Drop support for Node 8. Now requires Node 10+.

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