[Snyk] Security upgrade sequelize from 6.21.2 to 6.33.0

[Saamstep]

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

Snyk changed the following file(s):

• package.json
• package-lock.json

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Prototype Pollution SNYK-JS-DOTTIE-3332763	696
	Regular Expression Denial of Service (ReDoS) SNYK-JS-SEMVER-3247795	696

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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.
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Learn how to fix vulnerabilities with free interactive lessons:

🦉 Prototype Pollution 🦉 Regular Expression Denial of Service (ReDoS)