switch to sequelize 7 alpha

(related to https://security.snyk.io/vuln/SNYK-JS-SEQUELIZE-3324088 )

package.json

@@ -12,6 +12,7 @@
   "author": "",
   "license": "ISC",
   "dependencies": {
+    "bcrypt": "^5.1.0",
     "body-parser": "^1.20.1",
     "connect-redis": "^6.1.3",
     "cookie-encrypter": "^1.0.1",
@@ -27,11 +28,12 @@
     "ioredis": "^5.3.1",
     "js-base64": "^3.7.5",
     "mocha": "^10.2.0",
+    "otplib": "^12.0.1",
     "pg": "^8.9.0",
     "pg-hstore": "^2.3.4",
     "pug": "^3.0.2",
     "redis": "^4.6.4",
-    "sequelize": "^6.28.0",
+    "sequelize": "^7.0.0-alpha.9",
     "unit.js": "^2.1.1"
   }
 }