Bump sequelize from 5.21.2 to 6.29.0

Bumps [sequelize](https://github.com/sequelize/sequelize) from 5.21.2 to 6.29.0.
- [Release notes](https://github.com/sequelize/sequelize/releases)
- [Commits](sequelize/sequelize@v5.21.2...v6.29.0)

---
updated-dependencies:
- dependency-name: sequelize
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package-lock.json

@@ -21,7 +21,7 @@
     "botbuilder": "^4.6.0",
     "pg": "^7.12.1",
     "pg-hstore": "^2.3.3",
-    "sequelize": "^5.21.2"
+    "sequelize": "^6.29.0"
   },
   "scripts": {
     "test:unit": "npm run build && nyc mocha test/unit",