[Snyk] Security upgrade gatsby from 5.14.0 to 5.15.0

[Mapuppy09]

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
	Use of Uninitialized Resource SNYK-JS-WS-16722635	524

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