[Snyk] Security upgrade sequelize from 4.34.0 to 6.21.2#31

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-d08d5022f16dabd2900166532ad8260e

+169-135

Commits on Jul 24, 2022

fix: package.json & package-lock.json to reduce vulnerabilities
snyk-bot
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