chore(deps): update beanie requirement in /backend

Updates the requirements on [beanie](https://github.com/BeanieODM/beanie) to permit the latest version.
- [Release notes](https://github.com/BeanieODM/beanie/releases)
- [Changelog](https://github.com/BeanieODM/beanie/blob/main/docs/changelog.md)
- [Commits](BeanieODM/beanie@2.0.0...2.1.0)

---
updated-dependencies:
- dependency-name: beanie
  dependency-version: 2.1.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

backend/requirements.txt

@@ -65,7 +65,7 @@ websockets>=13.1,<17.0.0
 # Database clients
 motor>=3.6.0,<4.0.0
 pymongo>=4.10.0,<5.0.0
-beanie>=2.0.0,<2.1.0
+beanie>=2.0.0,<2.2.0
 redis>=5.2.0,<6.0.0
 qdrant-client>=1.12.0,<2.0.0