Bump psycopg2-binary from 2.9.8 to 2.9.9 in /backend

Bumps [psycopg2-binary](https://github.com/psycopg/psycopg2) from 2.9.8 to 2.9.9.
- [Changelog](https://github.com/psycopg/psycopg2/blob/master/NEWS)
- [Commits](psycopg/psycopg2@2.9.8...2.9.9)

---
updated-dependencies:
- dependency-name: psycopg2-binary
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

backend/requirements.txt

@@ -41,7 +41,7 @@ markdown==3.4.4
     # via -r requirements.in
 packaging==23.1
     # via gunicorn
-psycopg2-binary==2.9.8
+psycopg2-binary==2.9.9
     # via -r requirements.in
 pyjwt==2.7.0
     # via djangorestframework-simplejwt