⬆️ Update pydata-sphinx-theme requirement

Updates the requirements on [pydata-sphinx-theme](https://github.com/pydata/pydata-sphinx-theme) to permit the latest version.
- [Release notes](https://github.com/pydata/pydata-sphinx-theme/releases)
- [Commits](pydata/pydata-sphinx-theme@v0.13.0...v0.14.1)

---
updated-dependencies:
- dependency-name: pydata-sphinx-theme
  dependency-type: direct:production
...

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

pyproject.toml

@@ -43,7 +43,7 @@ testing = [
     "pytest-regressions",
 ]
 theme_furo = ["furo~=2023.7.0"]
-theme_pydata = ["pydata-sphinx-theme~=0.13.0"]
+theme_pydata = ["pydata-sphinx-theme>=0.13,<0.15"]
 theme_rtd = ["sphinx-rtd-theme~=1.0"]
 theme_sbt = ["sphinx-book-theme~=1.0"]