Update ipython requirement from ~=8.20.0 to ~=8.21.0

[dependabot[bot]]

Updates the requirements on ipython to permit the latest version.

Commits

• 8b1204b release 8.21.0
• 5720ade Whats new 8.21 (#14315)
• 5474053 Whats new 8.21
• 5f4d6ac Deprecate more complicated way of defining colors. (#14305)
• dad1cd5 Update IPython/utils/coloransi.py
• 4eab608 IPython.utils._process_posix: import pexpect only when needed (#14312)
• 643c75d pyproject.toml, setup.py: Declare backend-path (#14313)
• a069d99 Prepare removal of unnecessary options of ColorSchemeTable. (#14307)
• c928806 pyproject.toml, setup.py: Declare backend-path
• 93ffc15 Remove old mentions and uses of ipython_extension_dir (#14310)
• Additional commits viewable in compare view

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (f50c459) 11.49% compared to head (4f8eed7) 11.49%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #294 +/- ## ======================================= Coverage 11.49% 11.49% ======================================= Files 123 123 Lines 16745 16745 ======================================= Hits 1925 1925 Misses 14820 14820 ```

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