[Snyk] Security upgrade gatsby from 4.25.9 to 5.12.0

[hikerpig]

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


Snyk has created this PR to fix 2 vulnerabilities in the npm dependencies of this project.

Snyk changed the following file(s):

• demo/package.json

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Denial of Service (DoS) SNYK-JS-WS-7266574	768
	Uncaught Exception SNYK-JS-SOCKETIO-7278048	721

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[!IMPORTANT]

• Check the changes in this PR to ensure they won't cause issues with your project.
• Max score is 1000. Note that the real score may have changed since the PR was raised.
• This PR was automatically created by Snyk using the credentials of a real user.

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Learn how to fix vulnerabilities with free interactive lessons:

🦉 Uncaught Exception 🦉 Denial of Service (DoS)