Update ipython requirement from ~=8.15.0 to ~=8.18.0

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@8.15.0...8.18.0)

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

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

requirements.txt

@@ -15,4 +15,4 @@ pandas~=2.1.1
 nglview~=3.0.8
 moviepy~=1.0.3
 ipyevents~=2.0.2
-ipython~=8.15.0
+ipython~=8.18.0