Backport PR #46663: CI/DOC: pin pydata-sphinx-theme to 0.8.0 (#46667)

Co-authored-by: Joris Van den Bossche <jorisvandenbossche@gmail.com>

Author: simonjayhawkins

environment.yml

@@ -34,7 +34,7 @@ dependencies:
   - gitdb
   - numpydoc < 1.2  # 2021-02-09 1.2dev breaking CI
   - pandas-dev-flaker=0.4.0
-  - pydata-sphinx-theme
+  - pydata-sphinx-theme=0.8.0
   - pytest-cython
   - sphinx
   - sphinx-panels

requirements-dev.txt

@@ -20,7 +20,7 @@ gitpython
 gitdb
 numpydoc < 1.2
 pandas-dev-flaker==0.4.0
-pydata-sphinx-theme
+pydata-sphinx-theme==0.8.0
 pytest-cython
 sphinx
 sphinx-panels