fix: upgrade sequelize from 6.6.5 to 6.7.0

Snyk has created this PR to upgrade sequelize from 6.6.5 to 6.7.0.

See this package in npm:
https://www.npmjs.com/package/sequelize

See this project in Snyk:
https://app.snyk.io/org/jswheeler/project/a29f069b-a4c6-4ab0-84c3-7c6410f4d6b9?utm_source=github&utm_medium=referral&page=upgrade-pr

package.json

@@ -37,7 +37,7 @@
     "lodash": "^4.17.19",
     "pgtools": "^0.3.0",
     "prompt-confirm": "^2.0.4",
-    "sequelize": "^6.3.5",
+    "sequelize": "^6.7.0",
     "swagger-ui-express": "^4.1.4",
     "tc-core-library-js": "github:appirio-tech/tc-core-library-js#v2.6.4",
     "umzug": "^2.3.0",