chore(deps): bump sequelize-typescript from 2.1.3 to 2.1.5 (#4804)

Bumps [sequelize-typescript](https://github.com/RobinBuschmann/sequelize-typescript) from 2.1.3 to 2.1.5.
- [Release notes](https://github.com/RobinBuschmann/sequelize-typescript/releases)
- [Changelog](https://github.com/sequelize/sequelize-typescript/blob/master/CHANGELOG.md)
- [Commits](https://github.com/RobinBuschmann/sequelize-typescript/compare/v2.1.3...v2.1.5)

---
updated-dependencies:
- dependency-name: sequelize-typescript
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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package.json

@@ -195,7 +195,7 @@
     "sequelize": "^6.20.1",
     "sequelize-cli": "^6.4.1",
     "sequelize-encrypted": "^1.0.0",
-    "sequelize-typescript": "^2.1.3",
+    "sequelize-typescript": "^2.1.5",
     "slate": "0.45.0",
     "slate-md-serializer": "5.5.4",
     "slug": "^5.3.0",