Bump alembic in /{{cookiecutter.project_slug}}/backend

Bumps [alembic](https://github.com/sqlalchemy/alembic) from 1.11.3 to 1.13.1.
- [Release notes](https://github.com/sqlalchemy/alembic/releases)
- [Changelog](https://github.com/sqlalchemy/alembic/blob/main/CHANGES)
- [Commits](https://github.com/sqlalchemy/alembic/commits)

---
updated-dependencies:
- dependency-name: alembic
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

{{cookiecutter.project_slug}}/backend/poetry.lock

@@ -10,7 +10,7 @@ fastapi = "^0.98.0"
 uvicorn = "^0.23.2"
 pydantic = "^1.10.12"
 requests = "^2.31.0"
-alembic = "^1.11.3"
+alembic = "^1.13.1"
 psycopg2-binary = "^2.9.7"
 asyncpg = "^0.28.0"
 SQLAlchemy = "^2.0.20"