⬆ Bump alembic from 1.13.2 to 1.15.2 in /backend

Bumps [alembic](https://github.com/sqlalchemy/alembic) from 1.13.2 to 1.15.2.
- [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-version: 1.15.2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]