Bump sqlalchemy from 1.4.18 to 1.4.20

Bumps [sqlalchemy](https://github.com/sqlalchemy/sqlalchemy) from 1.4.18 to 1.4.20.
- [Release notes](https://github.com/sqlalchemy/sqlalchemy/releases)
- [Changelog](https://github.com/sqlalchemy/sqlalchemy/blob/master/CHANGES)
- [Commits](https://github.com/sqlalchemy/sqlalchemy/commits)

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

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Author: dependabot[bot]