[Snyk] Upgrade express from 4.17.1 to 4.21.1

[MonkeyGG2]

Snyk has created this PR to upgrade express from 4.17.1 to 4.21.1.

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 12 versions ahead of your current version.

• The recommended version was released on a month ago.

Issues fixed by the recommended upgrade:

	Issue	Score	Exploit Maturity
	Asymmetric Resource Consumption (Amplification) SNYK-JS-BODYPARSER-7926860	624	No Known Exploit
	Prototype Poisoning SNYK-JS-QS-3153490	624	Proof of Concept
	Cross-site Scripting (XSS) SNYK-JS-COOKIE-8163060	624	No Known Exploit
	Open Redirect SNYK-JS-EXPRESS-6474509	624	No Known Exploit
	Cross-site Scripting SNYK-JS-EXPRESS-7926867	624	No Known Exploit
	Regular Expression Denial of Service (ReDoS) SNYK-JS-PATHTOREGEXP-7925106	624	Proof of Concept
	Cross-site Scripting SNYK-JS-SEND-7926862	624	No Known Exploit
	Cross-site Scripting SNYK-JS-SERVESTATIC-7926865	624	No Known Exploit

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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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