Bump sequelize from 5.21.13 to 6.2.4

Bumps [sequelize](https://github.com/sequelize/sequelize) from 5.21.13 to 6.2.4.
- [Release notes](https://github.com/sequelize/sequelize/releases)
- [Commits](sequelize/sequelize@v5.21.13...v6.2.4)

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

package.json

@@ -42,7 +42,7 @@
     "pm2": "^4.4.0",
     "prettier": "^2.0.5",
     "pug": "^3.0.0",
-    "sequelize": "^5.21.13",
+    "sequelize": "^6.2.4",
     "sqlite3": "^4.2.0",
     "trailing-slash": "^2.0.0",
     "uikit": "^3.5.4",