Backport PR #39658: DOC: pin sphinx theme to avoid mobile dropdown bug (#39674)

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

Author: meeseeksmachine

environment.yml

@@ -113,5 +113,5 @@ dependencies:
   - tabulate>=0.8.3  # DataFrame.to_markdown
   - natsort  # DataFrame.sort_values
   - pip:
-    - git+https://github.com/pandas-dev/pydata-sphinx-theme.git@master
+    - git+https://github.com/pandas-dev/pydata-sphinx-theme.git@2488b7defbd3d753dd5fcfc890fc4a7e79d25103
     - git+https://github.com/numpy/numpydoc

requirements-dev.txt

@@ -76,5 +76,5 @@ cftime
 pyreadstat
 tabulate>=0.8.3
 natsort
-git+https://github.com/pandas-dev/pydata-sphinx-theme.git@master
+git+https://github.com/pandas-dev/pydata-sphinx-theme.git@2488b7defbd3d753dd5fcfc890fc4a7e79d25103
 git+https://github.com/numpy/numpydoc