Bump sqlalchemy in /{{cookiecutter.app_name}}/requirements

Bumps [sqlalchemy](https://github.com/sqlalchemy/sqlalchemy) from 1.3.8 to 1.3.9.
- [Release notes](https://github.com/sqlalchemy/sqlalchemy/releases)
- [Changelog](https://github.com/sqlalchemy/sqlalchemy/blob/master/CHANGES)
- [Commits](https://github.com/sqlalchemy/sqlalchemy/commits)

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

{{cookiecutter.app_name}}/requirements/prod.txt

@@ -7,7 +7,7 @@ click>=7.0
 
 # Database
 Flask-SQLAlchemy==2.4.1
-SQLAlchemy==1.3.8
+SQLAlchemy==1.3.9
 
 # Migrations
 Flask-Migrate==2.5.2