Bump pydata-sphinx-theme from 0.15.4 to 0.16.0 (#229)

Bumps [pydata-sphinx-theme](https://github.com/pydata/pydata-sphinx-theme) from 0.15.4 to 0.16.0.
- [Release notes](https://github.com/pydata/pydata-sphinx-theme/releases)
- [Changelog](https://github.com/pydata/pydata-sphinx-theme/blob/main/RELEASE.md)
- [Commits](pydata/pydata-sphinx-theme@v0.15.4...v0.16.0)

---
updated-dependencies:
- dependency-name: pydata-sphinx-theme
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements_doc.txt

@@ -1,6 +1,6 @@
 bokeh
 jupyter-sphinx
-pydata-sphinx-theme==0.15.4
+pydata-sphinx-theme==0.16.0
 sphinx==7.3.7
 sphinx-copybutton
 sphinx-notfound-page