Bump pydata-sphinx-theme from 0.13.3 to 0.15.2 (#190)

Bumps [pydata-sphinx-theme](https://github.com/pydata/pydata-sphinx-theme) from 0.13.3 to 0.15.2.
- [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@v0.13.3...v0.15.2)

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

Signed-off-by: dependabot[bot] <[email protected]>
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==0.13.3
+pydata-sphinx-theme==0.15.2
 sphinx==7.2.6
 sphinx-copybutton
 sphinx-notfound-page