Bump prisma from 5.0.0 to 6.1.0 in /backend

Bumps [prisma](https://github.com/prisma/prisma/tree/HEAD/packages/cli) from 5.0.0 to 6.1.0.
- [Release notes](https://github.com/prisma/prisma/releases)
- [Commits](https://github.com/prisma/prisma/commits/6.1.0/packages/cli)

---
updated-dependencies:
- dependency-name: prisma
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

backend/package.json

@@ -55,7 +55,7 @@
     "eslint-config-airbnb-typescript": "^17.1.0",
     "eslint-plugin-import": "^2.25.2",
     "nodemon": "^3.1.7",
-    "prisma": "^5.0.0",
+    "prisma": "^6.1.0",
     "ts-node": "^10.9.1",
     "typescript": "^5.1.6"
   }