Bump pydantic from 2.13.4 to 2.13.5 in /backend

Bumps [pydantic](https://github.com/pydantic/pydantic) from 2.13.4 to 2.13.5.
- [Release notes](https://github.com/pydantic/pydantic/releases)
- [Changelog](https://github.com/pydantic/pydantic/blob/v2.13.5/HISTORY.md)
- [Commits](pydantic/pydantic@v2.13.4...v2.13.5)

---
updated-dependencies:
- dependency-name: pydantic
  dependency-version: 2.13.5
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

backend/requirements-docker.txt

@@ -2,7 +2,7 @@ ariadne==1.1.0
 asyncpg==0.31.0
 fastapi==0.141.1
 httpx==0.28.1
-pydantic==2.13.4
+pydantic==2.13.5
 python-multipart==0.0.32
 python-jose==3.5.0
 uvicorn==0.52.4

backend/src/requirements_docker.txt

@@ -7,7 +7,7 @@ httpx==0.28.1
 isort==8.0.1
 mypy==1.14.1
 psycopg2-binary==2.9.12
-pydantic==2.13.4
+pydantic==2.13.5
 pytest==9.1.1
 pytest-asyncio==1.4.0
 pytest-cov==7.1.0