chore(deps): update dependency cpy-cli to v4 for gatsby-plugin-offline

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
cpy-cli	^3.1.1 -> ^4.1.0

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Release Notes

sindresorhus/cpy-cli

v4.1.0

Compare Source

• Add --concurrency flag (#​37) 8726315

v4.0.0

Compare Source

Breaking

• Require Node.js 12 (#​31) 7ee777f
• Remove the --parents flag. The copy is now recursive by default. To get flat output, use the --flat flag. Read more

Improvements

• Update cpy to v9 (#​34) 693722f

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