Bump sqlalchemy from 1.3.7 to 1.3.8 in /{{cookiecutter.app_name}} (#543)

Bumps [sqlalchemy](https://github.com/sqlalchemy/sqlalchemy) from 1.3.7 to 1.3.8.
- [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}}/Pipfile

@@ -11,7 +11,7 @@ click = ">=5.0"
 
 # Database
 Flask-SQLAlchemy = "==2.4.0"
-SQLAlchemy = "==1.3.7"
+SQLAlchemy = "==1.3.8"
 
 # Migrations
 Flask-Migrate = "==2.5.2"