CI: Pin pydata sphinx theme (pandas-dev#48989)

Author: phofl

environment.yml

@@ -100,7 +100,7 @@ dependencies:
   - natsort  # DataFrame.sort_values doctest
   - numpydoc
   - pandas-dev-flaker=0.5.0
-  - pydata-sphinx-theme
+  - pydata-sphinx-theme<0.11
   - pytest-cython  # doctest
   - sphinx
   - sphinx-panels

requirements-dev.txt

@@ -77,7 +77,7 @@ gitdb
 natsort
 numpydoc
 pandas-dev-flaker==0.5.0
-pydata-sphinx-theme
+pydata-sphinx-theme<0.11
 pytest-cython
 sphinx
 sphinx-panels