[Snyk] Fix for 6 vulnerabilities

[cscetbon]

Snyk has created this PR to fix 6 vulnerabilities in the yarn dependencies of this project.

Snyk changed the following file(s):

• website/package.json
• website/yarn.lock

Note for zero-installs users

If you are using the Yarn feature zero-installs that was introduced in Yarn V2, note that this PR does not update the .yarn/cache/ directory meaning this code cannot be pulled and immediately developed on as one would expect for a zero-install project - you will need to run yarn to update the contents of the ./yarn/cache directory.
If you are not using zero-install you can ignore this as your flow should likely be unchanged.

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Regular Expression Denial of Service (ReDoS) SNYK-JS-SEMVER-3247795	696
	Path Traversal SNYK-JS-WEBPACKDEVMIDDLEWARE-6476555	691
	Regular Expression Denial of Service (ReDoS) SNYK-JS-PATHTOREGEXP-7925106	666
	Cross-site Scripting (XSS) SNYK-JS-SERIALIZEJAVASCRIPT-6147607	626
	Cross-site Scripting (XSS) SNYK-JS-WEBPACK-7840298	616
	Improper Input Validation SNYK-JS-POSTCSS-5926692	479

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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:

🦉 Regular Expression Denial of Service (ReDoS)
🦉 Improper Input Validation
🦉 Cross-site Scripting (XSS)
🦉 More lessons are available in Snyk Learn