[Snyk] Upgrade sequelize from 4.20.3 to 4.44.4

[snyk-bot]

Snyk has created this PR to upgrade sequelize from 4.20.3 to 4.44.4.

:information_source: 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 100 versions ahead of your current version.
• The recommended version was released 2 years ago, on 2020-02-21.

The recommended version fixes:

Severity	Issue	PriorityScore (*)	Exploit Maturity
	SQL Injection SNYK-JS-SEQUELIZE-459751	686/1000 Why? Proof of Concept exploit, Has a fix available, CVSS 7.3	Proof of Concept
	SQL Injection SNYK-JS-SEQUELIZE-450221	686/1000 Why? Proof of Concept exploit, Has a fix available, CVSS 7.3	Proof of Concept
	Denial of Service (DoS) SNYK-JS-SEQUELIZE-543029	686/1000 Why? Proof of Concept exploit, Has a fix available, CVSS 7.3	No Known Exploit

(*) Note that the real score may have changed since the PR was raised.

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