Bump ipython from 8.20.0 to 8.21.0 in /requirements (#21778)

Bumps [ipython](https://github.com/ipython/ipython) from 8.20.0 to 8.21.0.
- [Release notes](https://github.com/ipython/ipython/releases)
- [Commits](ipython/ipython@8.20.0...8.21.0)

---
updated-dependencies:
- dependency-name: ipython
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements/prod.txt

@@ -1044,9 +1044,9 @@ inflection==0.5.1 \
 ipdb==0.13.13 \
     --hash=sha256:45529994741c4ab6d2388bfa5d7b725c2cf7fe9deffabdb8a6113aa5ed449ed4 \
     --hash=sha256:e3ac6018ef05126d442af680aad863006ec19d02290561ac88b8b1c0b0cfc726
-ipython==8.20.0 \
-    --hash=sha256:2f21bd3fc1d51550c89ee3944ae04bbc7bc79e129ea0937da6e6c68bfdbf117a \
-    --hash=sha256:bc9716aad6f29f36c449e30821c9dd0c1c1a7b59ddcc26931685b87b4c569619
+ipython==8.21.0 \
+    --hash=sha256:1050a3ab8473488d7eee163796b02e511d0735cf43a04ba2a8348bd0f2eaf8a5 \
+    --hash=sha256:48fbc236fbe0e138b88773fa0437751f14c3645fb483f1d4c5dee58b37e5ce73
 decorator==5.1.1 \
     --hash=sha256:b8c3f85900b9dc423225913c5aace94729fe1fa9763b38939a95226f02d37186 \
     --hash=sha256:637996211036b6385ef91435e4fae22989472f9d571faba8927ba8253acbc330