Bump pydata-sphinx-theme from 0.4.3 to 0.5.0 in /docs

Bumps [pydata-sphinx-theme](https://github.com/pydata/pydata-sphinx-theme) from 0.4.3 to 0.5.0.
- [Release notes](https://github.com/pydata/pydata-sphinx-theme/releases)
- [Changelog](https://github.com/pydata/pydata-sphinx-theme/blob/master/docs/changelog.rst)
- [Commits](pydata/pydata-sphinx-theme@v0.4.3...v0.5.0)

Signed-off-by: dependabot[bot] <support@github.com>

docs/api/requirements.txt

@@ -1,5 +1,5 @@
 # pip install -r requirements.txt
 
-pydata-sphinx-theme==0.4.3
+pydata-sphinx-theme==0.5.0
 myst-parser
 Sphinx