chore(deps): update ipython requirement in /compose/backend

Updates the requirements on [ipython](https://github.com/ipython/ipython) to permit the latest version.
- [Release notes](https://github.com/ipython/ipython/releases)
- [Commits](ipython/ipython@8.18.0...9.6.0)

---
updated-dependencies:
- dependency-name: ipython
  dependency-version: 9.6.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

compose/backend/pyproject.toml

@@ -23,7 +23,7 @@ dependencies = [
     "flask-shell-ipython~=0.4",
     "flask-sqlalchemy~=3.1",
     "gunicorn~=23.0",
-    "ipython~=8.18",
+    "ipython~=9.6",
     "marshmallow~=3.0",
     "pandas~=2.0",
     "psycopg2-binary~=2.8",