gh-36823: `ipython` 8.18 and related upgrades, remove `backcall`
    
<!-- ^^^^^
Please provide a concise, informative and self-explanatory title.
Don't put issue numbers in there, do this in the PR body below.
For example, instead of "Fixes #1234" use "Introduce new method to
calculate 1+1"
-->
<!-- Describe your changes here in detail -->

Upgrading ipython to latest. This is a small upgrade done as a follow-up
of [#36129](#36129), which allows
us to drop the `backcall` package. https://ipython.readthedocs.io/en/sta
ble/whatsnew/version8.html#ipython-8-18-and-8-18-1

The upgrade of pexpect to 4.9 and tornado to 6.4.0 add support for
Python 3.12. https://github.com/pexpect/pexpect/releases/tag/4.9,
https://www.tornadoweb.org/en/stable/releases/v6.4.0.html




<!-- Why is this change required? What problem does it solve? -->
<!-- If this PR resolves an open issue, please link to it here. For
example "Fixes #12345". -->
<!-- If your change requires a documentation PR, please link it
appropriately. -->

### 📝 Checklist

<!-- Put an `x` in all the boxes that apply. -->
<!-- If your change requires a documentation PR, please link it
appropriately -->
<!-- If you're unsure about any of these, don't hesitate to ask. We're
here to help! -->
<!-- Feel free to remove irrelevant items. -->

- [x] The title is concise, informative, and self-explanatory.
- [ ] The description explains in detail what this PR is about.
- [ ] I have linked a relevant issue or discussion.
- [ ] I have created tests covering the changes.
- [ ] I have updated the documentation accordingly.

### ⌛ Dependencies

<!-- List all open PRs that this PR logically depends on
- #12345: short description why this is a dependency
- #34567: ...
-->

<!-- If you're unsure about any of these, don't hesitate to ask. We're
here to help! -->
    
URL: #36823
Reported by: Matthias Köppe
Reviewer(s): John H. Palmieri

Author: Release Manager