Bump sqlalchemy from 2.0.47 to 2.0.48 in /flowdb/testdata/synthetic_data

Bumps [sqlalchemy](https://github.com/sqlalchemy/sqlalchemy) from 2.0.47 to 2.0.48.
- [Release notes](https://github.com/sqlalchemy/sqlalchemy/releases)
- [Changelog](https://github.com/sqlalchemy/sqlalchemy/blob/main/CHANGES.rst)
- [Commits](https://github.com/sqlalchemy/sqlalchemy/commits)

---
updated-dependencies:
- dependency-name: sqlalchemy
  dependency-version: 2.0.48
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]