Bump the pip-version group with 2 updates

Bumps the pip-version group with 2 updates: [ipython](https://github.com/ipython/ipython) and [sphinx](https://github.com/sphinx-doc/sphinx).


Updates `ipython` from 8.27.0 to 8.28.0
- [Release notes](https://github.com/ipython/ipython/releases)
- [Commits](ipython/ipython@8.27.0...8.28.0)

Updates `sphinx` from 8.0.2 to 8.1.3
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/v8.1.3/CHANGES.rst)
- [Commits](sphinx-doc/sphinx@v8.0.2...v8.1.3)

---
updated-dependencies:
- dependency-name: ipython
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: pip-version
- dependency-name: sphinx
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: pip-version
...

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

doc/requirements.in

@@ -1,10 +1,10 @@
 breathe == 4.35.0
 cython == 3.0.11
 furo == 2024.8.6
-ipython == 8.27.0
+ipython == 8.28.0
 numpy == 2.1.1
 pandas == 2.2.3
 pyarrow == 17.0.0
-sphinx == 8.0.2
+sphinx == 8.1.3
 sphinxcontrib-googleanalytics==0.4
 sphinx-copybutton==0.5.2

doc/requirements.txt

@@ -30,7 +30,7 @@ idna==3.10
     # via requests
 imagesize==1.4.1
     # via sphinx
-ipython==8.27.0
+ipython==8.28.0
     # via -r doc/requirements.in
 jedi==0.19.1
     # via ipython
@@ -80,7 +80,7 @@ snowballstemmer==2.2.0
     # via sphinx
 soupsieve==2.6
     # via beautifulsoup4
-sphinx==8.0.2
+sphinx==8.1.3
     # via
     #   -r doc/requirements.in
     #   breathe