[Snyk] Upgrade gatsby from 3.3.1 to 3.15.0

[hackistic]

Snyk has created this PR to upgrade gatsby from 3.3.1 to 3.15.0.

ℹ️ Keep your dependencies up-to-date. This makes it easier to fix existing vulnerabilities and to more quickly identify and fix newly disclosed vulnerabilities when they affect your project.

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• The recommended version is 208 versions ahead of your current version.

• The recommended version was released on 2 years ago.

Issues fixed by the recommended upgrade:

	Issue	Score	Exploit Maturity
	Improper Verification of Cryptographic Signature SNYK-JS-NODEFORGE-2430339	586	No Known Exploit
	Denial of Service (DoS) SNYK-JS-HTTPPROXYMIDDLEWARE-8229906	586	Proof of Concept
	Remote Memory Exposure SNYK-JS-DNSPACKET-1293563	586	No Known Exploit
	Server-side Request Forgery (SSRF) SNYK-JS-IP-6240864	586	Proof of Concept
	Denial of Service (DoS) SNYK-JS-FILETYPE-2958042	586	No Known Exploit
	Sandbox Bypass SNYK-JS-WEBPACK-3358798	586	Proof of Concept
	Regular Expression Denial of Service (ReDoS) SNYK-JS-WEBSOCKETEXTENSIONS-570623	586	Proof of Concept
	Open Redirect SNYK-JS-NODEFORGE-2330875	586	Proof of Concept
	Prototype Pollution SNYK-JS-NODEFORGE-2331908	586	No Known Exploit
	Improper Verification of Cryptographic Signature SNYK-JS-NODEFORGE-2430337	586	No Known Exploit
	Improper Verification of Cryptographic Signature SNYK-JS-NODEFORGE-2430341	586	No Known Exploit
	Denial of Service (DoS) SNYK-JS-HTTPPROXY-569139	586	Proof of Concept
	Prototype Pollution SNYK-JS-DOTPROP-543489	586	Proof of Concept
	Server-Side Request Forgery (SSRF) SNYK-JS-IP-7148531	586	Proof of Concept
	Regular Expression Denial of Service (ReDoS) SNYK-JS-ISSVG-1085627	586	Proof of Concept
	Regular Expression Denial of Service (ReDoS) SNYK-JS-ISSVG-1243891	586	Proof of Concept
	Regular Expression Denial of Service (ReDoS) SNYK-JS-POSTCSS-1090595	586	Proof of Concept
	Regular Expression Denial of Service (ReDoS) SNYK-JS-POSTCSS-1255640	586	Proof of Concept
	Regular Expression Denial of Service (ReDoS) SNYK-JS-POSTCSS-1090595	586	Proof of Concept
	Regular Expression Denial of Service (ReDoS) SNYK-JS-POSTCSS-1255640	586	Proof of Concept
	Cross-site Scripting (XSS) SNYK-JS-WEBPACK-7840298	586	Proof of Concept

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Important

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

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