Bump psycopg2-binary from 2.8.3 to 2.8.4 in /{{cookiecutter.app_name}}

Bumps [psycopg2-binary](https://github.com/psycopg/psycopg2) from 2.8.3 to 2.8.4.
- [Release notes](https://github.com/psycopg/psycopg2/releases)
- [Changelog](https://github.com/psycopg/psycopg2/blob/master/NEWS)
- [Commits](https://github.com/psycopg/psycopg2/commits)

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

{{cookiecutter.app_name}}/Pipfile

@@ -12,7 +12,7 @@ click = ">=5.0"
 # Database
 Flask-SQLAlchemy = "==2.4.1"
 SQLAlchemy = "==1.3.10"
-psycopg2-binary = "==2.8.3"
+psycopg2-binary = "==2.8.4"
 
 # Migrations
 Flask-Migrate = "==2.5.2"