build: bump the documentation group with 2 updates

Bumps the documentation group with 2 updates: [plotly](https://github.com/plotly/plotly.py) and [sphinx-notfound-page](https://github.com/readthedocs/sphinx-notfound-page).


Updates `plotly` from 5.24.1 to 6.0.0
- [Release notes](https://github.com/plotly/plotly.py/releases)
- [Changelog](https://github.com/plotly/plotly.py/blob/master/CHANGELOG.md)
- [Commits](plotly/plotly.py@v5.24.1...v6.0.0)

Updates `sphinx-notfound-page` from 1.0.4 to 1.1.0
- [Changelog](https://github.com/readthedocs/sphinx-notfound-page/blob/main/CHANGELOG.rst)
- [Commits](readthedocs/sphinx-notfound-page@1.0.4...1.1.0)

---
updated-dependencies:
- dependency-name: plotly
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: documentation
- dependency-name: sphinx-notfound-page
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: documentation
...

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

pyproject.toml

@@ -87,7 +87,7 @@ doc = [
     "nbformat==5.10.4",
     "numpydoc==1.8.0",
     "pandas==2.2.3",
-    "plotly==5.24.1",
+    "plotly==6.0.0",
     "pyiges[full]==0.3.1",
     "pypandoc==1.15",
     "pytest-sphinx==0.6.3",
@@ -98,7 +98,7 @@ doc = [
     "sphinx-design==0.6.1",
     "sphinx-gallery==0.18.0",
     "sphinx-jinja==2.0.2",
-    "sphinx-notfound-page==1.0.4",
+    "sphinx-notfound-page==1.1.0",
     "sphinx==8.1.3",
     "sphinxcontrib-websupport==2.0.0",
     "sphinxemoji==0.3.1",