[Snyk] Security upgrade gatsby from 2.15.28 to 3.13.0

[bryanweast]

This PR was automatically created by Snyk using the credentials of a real user.


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

Snyk changed the following file(s):

• package.json
• package-lock.json

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Server-Side Request Forgery (SSRF) SNYK-JS-IP-7148531	718

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🦉 Server-Side Request Forgery (SSRF)