chore(deps): bump sqlalchemy from 2.0.48 to 2.0.51 in /src

Bumps [sqlalchemy](https://github.com/sqlalchemy/sqlalchemy) from 2.0.48 to 2.0.51.
- [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: 2.0.51
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

src/requirements.txt

@@ -1,7 +1,7 @@
 bcrypt==5.0.0
 configparser==7.2.0
 gunicorn==25.3.0
-sqlalchemy==2.0.48
+sqlalchemy==2.0.51
 Flask==3.1.3
 Werkzeug==3.1.7
 pyotp==2.9.0