Bump sqlalchemy from 2.0.20 to 2.0.21 (#657)

Bumps [sqlalchemy](https://github.com/sqlalchemy/sqlalchemy) from 2.0.20 to 2.0.21.
- [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-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements.txt

@@ -11,4 +11,4 @@ pytest==7.4.2
 pytest-aiohttp==1.0.5
 pytest-cov==4.1.0
 pytest-mock==3.11.1
-sqlalchemy==2.0.20
+sqlalchemy==2.0.21