[Snyk] Security upgrade gatsby-plugin-sharp from 2.3.10 to 2.13.0

[baby636]

Snyk has created this PR to fix 1 vulnerabilities in the npm dependencies of this project.

Snyk changed the following file(s):

• docs/package.json

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Predictable Value Range from Previous Values SNYK-JS-FORMDATA-10841150	863

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