fix(deps): update dependency sequelize to v6 [security]

Author: renovate[bot]

package.json

@@ -38,7 +38,7 @@
     "koa-mount": "4.0.0",
     "koa-router": "7.4.0",
     "koa-static": "5.0.0",
-    "sequelize": "4.44.4",
+    "sequelize": "6.29.0",
     "sqlite3": "4.2.0"
   },
   "devDependencies": {