Update sqlalchemy requirement from 2.0.19 to 2.0.21

Updates the requirements on [sqlalchemy](https://github.com/sqlalchemy/sqlalchemy) to permit the latest version.
- [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
...

Signed-off-by: dependabot[bot] <[email protected]>

pyproject.toml

@@ -35,7 +35,7 @@ pandas = "2.0.3"
 prettytable = "3.9.0"
 python = ">=3.8, <4.0"
 python-environ = "0.4.54"
-SQLAlchemy = "2.0.19"
+SQLAlchemy = "2.0.21"
 sqlalchemy-utils = "0.41.1"
 time-machine = "2.11.0"