Update ipykernel requirement from ~=6.29 to ~=7.1

Updates the requirements on [ipykernel](https://github.com/ipython/ipykernel) to permit the latest version.
- [Release notes](https://github.com/ipython/ipykernel/releases)
- [Changelog](https://github.com/ipython/ipykernel/blob/main/CHANGELOG.md)
- [Commits](ipython/ipykernel@v6.29.0...v7.1.0)

---
updated-dependencies:
- dependency-name: ipykernel
  dependency-version: 7.1.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

docs/doc_requires.txt

@@ -2,7 +2,7 @@ sphinx~=8.1
 nbsphinx~=0.9
 pygments~=2.19
 shibuya~=2025.2
-ipykernel~=6.29
+ipykernel~=7.1
 matplotlib~=3.10
 myst_parser~=4.0  # Must Be Underscore, not Hyphen
 sphinx-intl~=2.3

pyproject.toml

@@ -81,7 +81,7 @@ docs = [
     "nbsphinx~=0.9",
     "pygments~=2.19",
     "shibuya~=2025.2",
-    "ipykernel~=6.29",
+    "ipykernel~=7.1",
     "matplotlib~=3.10",
     "myst-parser~=4.0",
     "sphinx-intl~=2.3",