chore(deps): bump alembic from 1.13.1 to 1.13.2 in /backend

Bumps [alembic](https://github.com/sqlalchemy/alembic) from 1.13.1 to 1.13.2.
- [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-patch
...
Signed-off-by: dependabot[bot] <support@github.com>

backend/requirements.txt

@@ -13,7 +13,7 @@ passlib[bcrypt]==1.7.4
 requests==2.32.3
 aiohttp==3.9.5
 sqlalchemy==2.0.30
-alembic==1.13.1
+alembic==1.13.2
 peewee==3.17.5
 peewee-migrate==1.12.2
 psycopg2-binary==2.9.9